Pressure washing rubber roof

Instead of intense scrubbing to remove stains on the roof, why not coat it with one of the purpose-built roof paints to get it all sparkly?

Pressure washers and EPDM roofs are not good mates. A newbie with a pressure washer can do a lot of damage with a pressure washer, if not trained.

Those spots won't come off.
I give the roof a light wash to remove surface dirt so it won't run off and streak the sides.

I've got the same type spots on mine that don't come off even with pressure washing. I try to go somewhat easy with the pressure washer for fear of doing damage and finally just gave up getting the roof completely clean. I mainly just try to get the mildew debris cleared from the roof and near the edges and just live with the spots. I live in Oregon and park my TT under a couple big trees so I have absolutely amazing amounts of moss and debris that collect.

Your going to put a lot of wear on the surface and stress on the adhesive underneath with a pressure washer.
The roof will last the longest if it's left alone - cleaning only removes the white coating and shortens its life.