We do quite a few for the high volume national builders. Cscs will be needed. Most of the work is in the detaping of the frames after the painters have finished. The glass will have been covered with film so 90% of the time will just need a normal clean. Equipment to have with you is mop, squeegee, Stanley scraper, fresh blade, Stanley knife (to cut into the frame to remove tape) and a dry paint brush to British out any dust from the sill.
You will only make this kind of work pay if you are quick. (Or employ reasonably quick staff)
3 bed around 1.5 hours.
4 bed around 2 hours.
5 bed upto 3.5 hours.
The people that tell you they won't do build cleans because of silicone on the glass are not talking about this type of work. With your smaller local builders then expect silicone and messy sites but the Nationals are not like that. We will be doing upwards of 50 plots this month and there will be exactly 0 silicone to remove.
You will be expected to be able to do the clean after the painter and before the mastic man is booked in, most sites we get a weeks notice but some sites are less organised.
Not gonna discuss prices but there is money to be made with the right setup.