hi
dont do many yet!but i like pressure washing them of then wfp to polish and rinse.
i know its two processes but once the pw has done all the work its only a spray over with wfp not rubbing so dead quick and white upvc shines custies dead happy.
only thing with pressure turn it down you dont need full wack even on a 5 hp machine i have blown of gutter clips and bits of plastic then you have to refit them which kills the job.
cheers
john