Having coped with a moderatly dirty windscreen for a while i decided to treat it to a proper clean. Handilly enough I found a can of Halfords glass-cleaning foam which i used both outside and inside. What a mistaka to maka. While it might've removed the dirt it left an oily/shiny/petroleum coloured residue which doesnt want to be wiped off. It is generally transparent, but when the sunlight falls on it at a certain angle and the road itself is in shade i can't see a thing. This only happens in one or two spots on my daily route but is annoying enough and dangerous too.
What can you recommend for cleaning windows inside and outside(well, i think outside is not too bad now that i have used the screenwash a coupla times), something that will definately evaporate after it finished cleaning and will remove any grime or grease.