approx 20%, yes 20% of our customers have self cleaning glass,also have a few that have been treated with everclean - its the con of the decade, it needs the right conditions to work and even then only very light dust will be removed.
A waste of money, and I'm not being biased about it. I would love someone from Pilkington to come on here and challenge me about it, I could take hundreds of photo's of customers windows that are filthy, if anything the film on the window actually grips the dirt.