know where your coming from and have the same question though havent jiffed or ciffed the upvc because ive thought at some point of offering a colour restore service (anybody done this?).My question back at you and others though is we clean windows but kinda how far do we go before you start charging for the extra work of scrapping paint of windows and cement and plants etc etc - sometimes i think im there to clean the windows but where is the line between cleaning windows and maintenance - does this make sense and any thoughts guys re whats an acceptable standard and just how far do we go with the clean (ie had house the other day and 4 of the windows had huge dried on hard silicone which i removed with scraper but hell added a fair bit of time getting it off).to summarise - HOW FAR DO WE GO? (somebod is bound to say ALL THE WAY) LOL
thanks john, where did you get solvent cleaner, whats its brand name???