I can honestly say that id charge£10 front or £15 f+b. i pick up this type of work every week from canvassing. Its down to having the balls to have a min price and sticking to it. I touch nothing less than £10 these days as i know im worth £2.50 a week to keep the customers happy not because im selfish or nieve, just because i can. £2.50-£3 a week to keep there windows clean and house looking well maintained with frames and seals all looking bish bosh is peanuts. I do 1 bed flats and still get £15 f+b. have a price and stick to it.