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I agree that a mild, suitably distant spray from a pressure washer is fine. Just don't let some hair-brained kid do it. The idea is to merely knock the loose larger grit off before it gets ground into the finish by scrubbing.
For that reason, just a common garden hose does pretty good. Wet the surfaces down, and let soak, to soften grime and especially dried bug juice, then spray a little harder to knock off whatever will come loose. A soapy powerwasher spray will probably do better in the soak dept. Some bug juice will even erode in this mild manner, and the gritty road dirt that sticks to the freshly splattered sticky outer surface comes off first, again saving scratches.
We do the "commercial floor wax" re-coat once every year or two on our 2004 Luan/glass siding here. Others have detailed the cleaning/waxing process elsewhere on this forum (It initially looks like heck - blotchy - until the third coat). We did the four-coat original coat (it's a workout) and it just takes another single coat, once a year or less, to keep it shiny and slippery to dirt and bugs. We've been doing it for several years and it stands up to sun and weather just fine. Our original TT had lost some of it's shine long before we got it and this fixed it. Even the decals are brighter, no doubt.
Some friends, that we camp with, bought a discounted fixer-upper 2000 5vr that had been a camp office in the Arizona sun for years and probably never had been waxed and seldom cleaned, if ever. The unit needed mostly a good cleaning inside and out, but the Luan/glass exterior was dull and badly chalked. After they looked at our TT, we gave it a try on theirs. Wow! What a difference. Their 14 year old white gel-coat looks like new now too. The decals look a lot better, but there was some sun-side cracking that didn't come out of course. From a 50' distance the weather checking of the decals are not noticable, but they are definately much brighter.
I can't say enough good about the floor wax method and to think we were scared to try it. We figured that we would just strip it with stripping product if some sort of failure made it necessary. Dish washing liquid does not seem to affect it. The floor wax chemists did a heck of a job formulating it apparently.
Wes
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