To clean an RV roof, identify the roof type first, then use a mild, roof-safe cleaner and a soft brush on an extension pole, working in sections from front to back and rinsing the sidewalls as you go so you don’t leave streaks. Do it 2–4 times a year. What matters most is what you don’t do: no pressure washer, no straight Dawn or petroleum-based degreaser on a rubber (EPDM or TPO) roof, and no walking on a roof that isn’t built to hold you. In Florida’s heat and humidity a roof grows algae and mildew fast, and that neglected roof is where most sidewall black streaks actually start.
The roof is the most ignored and most misunderstood surface on an RV. It’s out of sight, it’s a little scary to get up on, and half the advice online will quietly ruin it. Owners argue for pages about whether Dawn is fine or a disaster, whether you can pressure wash it, and how often it really needs doing. Here’s the straight version from someone who cleans and seals RV roofs for a living in the Florida sun: the method, the products that are safe versus the ones that dry out a membrane, and the Florida-specific reasons your roof needs more attention here than it would up north.
What kind of RV roof do you have?
This is the step everyone skips, and it decides everything else. The wrong cleaner on the wrong roof is how people crack, dry out, or streak a roof that was perfectly fine. Most RVs have one of four roofs:
| Roof type | How to tell | Cleaning notes |
|---|---|---|
| EPDM rubber | Most common on trailers/5th wheels; a rubbery membrane that leaves a faint chalky white residue on your hand | Mild cleaner only; no petroleum, citrus, or abrasive products — they dry it out and shorten its life |
| TPO rubber | Also a membrane, but brighter white and doesn’t chalk; common on newer rigs | Gentle wash, minimal scrubbing; over-cleaning does more harm than good |
| Fiberglass | Hard, smooth, shiny gelcoat surface (like the sidewalls) | Handles more; can be washed, and waxed/sealed for UV protection |
| Aluminum | Older rigs; a metal roof surface | Wash and dry; watch for oxidation and seams |
If you’re not sure, check your owner’s manual or the manufacturer’s roof label — and when in doubt, treat it as a rubber membrane and go gentle. You can’t hurt a fiberglass roof by being too careful, but you can absolutely hurt a rubber one by being too aggressive.
How to clean an RV roof, step by step
The method is the same across roof types; only the cleaner changes. Work on a cool, shaded roof (not one that’s been baking in the Florida afternoon sun), and never do it alone if you have to get up top.
- Clear the roof first. Blow or brush off leaves, acorns, and debris, and check that gutters and drains are clear so water sheds off the sides instead of pooling on seams.
- Rinse. Wet the whole roof with a garden hose (not a pressure washer) to float off loose grime before you scrub.
- Wash in sections, front to back. Use your roof-safe cleaner and a soft-bristle brush on an extension pole. Small sections, gentle pressure — you’re lifting dirt, not grinding it.
- Rinse the sidewalls as you go. This is the step owners forget: roof runoff carries dirt and cleaner down the walls and streaks them. Keep the sides wet and rinse them off the moment you finish a section.
- Inspect while you’re up there. Look at every seam, seal, and the caulking around vents, AC, and skylights. A cracked seal is a leak waiting to happen, and catching it on wash day is the real payoff of cleaning the roof.
- Dry and (if needed) protect. Let it dry, then apply a UV protectant made for your roof type if it calls for one (more on that below).
What to clean an RV roof with (and what to avoid)
This is the argument that fills forum threads. In a long Jayco owners thread on roof cleaners, Dawn was the most-mentioned product — and also the most-warned-against, because it strips wax and sealant and leaves the surface unprotected. One owner recounted calling the membrane maker Dicor and being told by an R&D director to avoid petroleum-based cleaners entirely (many common household detergents, Dawn included, are petroleum-derived). The safe, boring answer wins here:
| Use | Why |
|---|---|
| A dedicated RV rubber-roof cleaner | Formulated for EPDM/TPO; many add a UV protectant |
| A mild, diluted all-purpose cleaner (e.g. Simple Green) | Gentle; the maker’s own dilution method is roof-safe |
| A soft-bristle brush + extension pole | Cleans without gouging the membrane or forcing you onto the roof |
| Avoid | Why |
|---|---|
| Straight Dawn / dish degreasers | Strips protective wax and sealant; petroleum-based |
| Citrus, petroleum, or solvent cleaners on rubber | Dry out and prematurely age EPDM/TPO membranes |
| Abrasive pads, stiff brushes, or scouring powder | Scratch the membrane and tear the surface |
| Anything that leaves the roof slick | Oil-soap and wax washes make a roof dangerously slippery underfoot |
Whatever you use, dilute it, keep it off a hot surface, and rinse thoroughly — residue is what streaks the sidewalls and dulls the finish.
Can you walk on an RV roof?
Only if yours is rated to hold you — and many aren’t. Check your manual before you ever step up. A “walkable” roof still isn’t safe when it’s wet and soapy, which is exactly the state it’s in mid-clean; oil-soap and wash-and-wax products in particular leave it slick enough to slide off. The safer approach for most owners is to stay on a stable ladder or scaffold at the edge and reach the middle with a long extension pole. If your rig is tall, your roof isn’t walkable, or you just don’t love the idea of being up there with a hose, that’s the honest case for having a pro handle it as part of a full mobile RV detail; the roof is the one surface where a fall or a forced seam costs far more than the cleaning itself.
Why you should never pressure wash an RV roof
A pressure washer feels like the fast way to do a big roof. It’s the fastest way to a leak. High-pressure water drives past caulking and roof seals, lifts the edges of the membrane, and gets under the sealant around vents and AC units. Once water is inside the roof, you’re looking at rot and delamination, not a wash. We won’t put a pressure washer anywhere near an RV roof, and it’s the number-one way we see owners turn a $20 bottle of cleaner into a four-figure water-damage repair. A garden hose and a soft brush is all a roof should ever feel.
Central Florida’s heat, humidity, and near-daily summer rain grow algae, mildew, and black mold on an RV roof faster than a drier climate does — especially on a rig that sits outside under trees. On the Florida roofs we clean, the roof is almost always where a black-streak or mildew problem started; the runoff from a neglected roof carries dirt and algae straight down the sidewalls. Clean the roof on schedule here and you prevent the black streaks before they ever reach the walls.
How often to clean an RV roof in Florida
Plan on cleaning an RV roof 2–4 times a year — and in Central Florida, lean toward the higher end if your rig lives outdoors. A roof parked under trees or through our summer rainy season can grow a green or black film in a matter of weeks, so a quick rinse and light wash every season keeps it from ever building up. A rig that’s stored covered or indoors can go on the lighter schedule. The trap in Florida isn’t skipping the wash on purpose; it’s not realizing how fast a roof goes from “a little dirty” to streaking your walls and holding moisture against the seals. If you already run a wider maintenance rhythm, fold the roof into it — here’s how often to wash and wax the whole rig in our climate.
Don’t want to get up on the roof?
We clean RV roofs the safe way — the right cleaner for your membrane, a seal-and-seam inspection included, and no ladder work for you. We come to your driveway, storage lot, or campsite across Central Florida.
Get an RV roof cleaning quoteDo you need to protect the roof after cleaning it?
It depends on the roof. A rubber (EPDM/TPO) roof benefits from a UV protectant made for membranes — Florida’s sun is what ages a rubber roof, and a protectant slows the chalking and drying that eventually cracks it. A fiberglass roof can be waxed or sealed like the sidewalls. The bigger, longer-lasting move for a fiberglass rig in this climate is an RV ceramic coating, which bonds a hard UV-resistant layer to the gelcoat so the roof and walls shed dirt and stop oxidizing between washes. Whichever route you take, the protectant only works on a clean, dry roof, which is the whole reason the cleaning comes first.
Key takeaways
- Identify the roof first (EPDM, TPO, fiberglass, or aluminum) — it decides which cleaner is safe.
- Use a mild, roof-safe cleaner and a soft brush on a pole; skip straight Dawn and any petroleum, citrus, or abrasive product on a rubber roof.
- Never pressure wash a roof — it forces water past seals and causes leaks.
- Rinse the sidewalls as you go, or roof runoff streaks the walls.
- In Florida, clean the roof 2–4 times a year — algae and mildew build fast here, and the roof is where sidewall streaks begin.
Frequently asked questions
What is the best thing to use to clean an RV roof?
A dedicated RV rubber-roof cleaner, or a mild all-purpose cleaner like diluted Simple Green, applied with a soft-bristle brush on an extension pole. On a rubber (EPDM or TPO) roof, avoid petroleum-based degreasers, citrus cleaners, and abrasives — they dry out and age the membrane. On fiberglass you have more room, and a wash-and-wax product adds some UV protection.
Is Dawn bad for an RV roof?
Dawn cleans, but it strips protective wax and sealant and is petroleum-based, so most experienced owners and membrane makers steer away from it on rubber roofs — it can leave the surface unprotected and dry it out over time. A light, heavily diluted amount rinsed off quickly won’t destroy a roof, but a purpose-made RV roof cleaner or a mild all-purpose cleaner is the safer default.
Can you pressure wash an RV roof?
No. High-pressure water forces its way past caulking and roof seals, lifts the edges of a rubber membrane, and gets under the sealant around vents and AC units — leading to leaks, rot, and delamination. Use a garden hose and a soft brush only. A pressure washer is the most common way owners turn a cheap wash into an expensive water-damage repair.
How often should you clean an RV roof in Florida?
Two to four times a year, leaning toward the higher end if your rig lives outdoors. Central Florida’s heat, humidity, and summer rain grow algae and mildew on a roof quickly — a rig parked under trees can film over in weeks. A covered or indoor-stored rig can go on the lighter schedule. Regular light cleaning beats occasional heavy scrubbing, which is harder on the roof.
Can you walk on an RV roof?
Only if your roof is rated to be walked on — check your owner’s manual, because many are not. Even a walkable roof is dangerous when it’s wet and soapy, and oil-soap or wax-based cleaners make it slick. When possible, work from a stable ladder or scaffold at the edge and reach the center with an extension pole rather than standing on the roof.
Do you need to put anything on the roof after cleaning it?
On a rubber roof, a UV protectant made for EPDM/TPO membranes helps — Florida sun is what ages a rubber roof, and a protectant slows the chalking and drying. A fiberglass roof can be waxed or sealed, and a ceramic coating is the longer-lasting option for UV protection in this climate. Any protectant only bonds to a clean, dry roof, so cleaning comes first.
How do I know if my RV roof is EPDM, TPO, or fiberglass?
Fiberglass is a hard, smooth, shiny surface like the sidewalls. EPDM and TPO are rubbery membranes — EPDM tends to leave a faint chalky white residue on your hand and is duller, while TPO is brighter white and doesn’t chalk. Your owner’s manual or the manufacturer’s roof label will confirm it. If you can’t tell, treat it as a rubber membrane and clean gently.
