i work with my mate one day a week,2moz actually,and this lady came out b4,we jus did her fronts,6 big windows,£2! and she came out complainin about suds on the window sill,it was rain btw,we sed if u want ur frames n sills cleanin you'l have to pay extra espec wen ur house is soooo underpriced,but she wunt shut up,aparently her son is a window cleaner :

and he wipes all the frames and sill free of charge and so shud we,we jus sed yeh but i bet ur son charges a hell of alot more than £2 for 6 big windows,they never happy,no matter how cheap you do they house for,and how gud of a job you do on da actual windows,they always find sumot to complain about,ungratful gits sum people! do my head in! lol