absolute no spots, no residue, no swirl marks, no effort required pretty much! this is all i do:
1. panel-by-panel, starting with roof, use a generously soaked wash mitt and go over the surface left-to-right-to-left repeatedly once.
2. rinse in same bucket of solution, then wring to between dry and moist, and go over the surface in the same motion once more.
3. use a microfiber towel to wipe dry immediately.
it uses powerful chemicals that bond with dirt particles et al and creates a suspended emulsion kind of effect tt prevents swirling and scratching. it cleans amazingly well and leaves a very slick finish. highly, highly recommended.
check this out:
btw, how do i embed videos in posts?