if a first clean is really filthy then i just spray virosol (in a pressure sprayer) at the windows and frames,leave for a few minutes and wfp off(with hot water).results are really good.normally i just use hot pure for first cleans though.
i would never use bleach.
1.i hate the smell of the stuff!
2.its a very strong chemical that could damage a customers property/plants etc(i wouldnt like to take the chance).
the end.
