these are hard to price up when your inexperienced but once you know roughly how long theyll take you they are good little earners.
i price them up and get £40-£60 an hour on these types of jobs.
i use either a 5L pressure sprayer(usually this gets used for conny roof jobs),a small bottle sprayer(spray on brush or directly on the surface being cleaned)or a backpack.i use virosol.
spray on.leave for a few mins and scrub and rinse until clean!
i also have some scourers and cif cream cleaner that i occasionally use on stubborn ground floor UPVC/frames etc and some b and q sticky stuff remover.
add on jobs are harder work than your average maintenance window cleaning so charge higher to make it worth your while.
i also have 20m of extension hose and plug into customers outside taps occasionally if its a fairly big UPVC clean and i want to save my pure in the tank.