On all my previous travel trailers I used only RV roof cleaners and conditioners. Others say you can use other cleaning agents, but the instruction I received with mine at the time say use RV cleaners. I never deviated, and never had roof or seal or caulking issues.
My current 5er has an Alpha roof. The instructions with it said it's OK to use Spic n Span or any other cleaner. So, really, it depends on the recommendations of your specific camper. If you have that information, use the manufacturer's recommendations. If you don't have that, play it safe and just pick up a bottle of RV roof cleaner and conditioner from any RV parts place.
If you use too harsh a cleaner, over time, it can cause the rubber to deteriorate by stripping out the oils that are there to keep the rubber soft and pliable, not to mention deterioration on your calking and anything rubber the cleaners touch (and what drips down the side of the camper will strip the wax off, making a simple job of cleaning the roof, now a job requiring you to wax the camper again).
Good luck.
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2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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