Wax on Wax off.

What to use is another topic but I've been using Protect ALL for years with excellent results. I bought a WashWaxAll kit at a high price and still prefer Protect ALL. Washing isn't usually necessary unless the road grime is very heavy. Just spray it on, wipe it around and a little buffing to finish up. Like its name says, use it on everything. It works great to get the bugs off the windshield and makes the rubber around window look like new but it will turn your rag black doing it. It not only makes it shine but leaves a coating of UV protecterant behind. The vinyl on my 15+ year old previous MH didn't show any sign of cracking or checking even though the passenger side faced due south year around. My friend with the exact same MH used 303 and his vinyl failed miserably - it checked, crazed and faded. I couldn't convince him to switch to Protect ALL. You can find it in the RV section of most Walmarts. CW sells it by the gallon and I usually catch it on sale. Highly recommended! Spray it on, wipe it off and a little buffing. If you have to do much buffing, you're using too much.