I used the Gel-Gloss RV Wash and Wax for years, and it works pretty well, but I recently got the Griot's Garage foam cannon along with their Foaming Surface Wash and Foaming Poly Gloss. It leaves a better protective coating on the RV, but it does take more steps in the washing process. My previous process was 1) pressure wash 2) wash with the Gel-Gloss (mixed in a bucket of water) using a long-handled brush and wash mitt 3) rinse with the pressure washer. For the Griot's system there are a few more steps: 1) pressure wash 2) apply wash foam with foam cannon 3) use long handled brush and wash mitt to wash 4) pressure rinse 5) apply foaming poly gloss 6) pressure rinse.
You can really see the surface beading the rinse water after applying the poly gloss, and bugs don't stick to the surface as much, and are much easier to remove during subsequent washes.
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