Just had my minion do that this weekend. After trying several products, I ended up using a product call bleach white. It's used for white wall tires. It will strip wax so you need to spray onto a tooth brush. Then carefully brush the moldings. Then quickly rinse with fresh water. We waxed the RV afterword. They are as bright as brand new. I tried other products, but it works the best. You can wipe it on with a wax applicator, and rince, but it needed scrubbing and small brush worded the best. Takes lots time, but it's a yearly chore. My RV is in the weather uncovered and still looks new.
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