How to whiten the roof without harming wax job?

The primary reason I wash my roof with gently soap yearly in the spring is to get a good look at its condition. I inspect the caulking, vents, a/c shroud, wineguard antennae and all the other potential leak areas. Also a good time to treat the slide out seals that cant be reached from the ground. For sure be cautious on a wet/soapy roof and ensure your roof can take weight as per manufacturer.

Daryll