David, you say you saw a difference in speed staright away, yet you had problems, I myself am fininding it slower and have had one problem out of 40 houses, have gone back to see after the clean was dry, there are a few spots where it had run from top seal and left say 5 or 6 little spots in a line, I am telling customers as and when I need to, I got another new jopb today as a lady was singing my praises I have wanted to get more houses in the area as they are a clicky lot, I have 4 so far all are over £25 houses, so this is a right result, yet to lose a customer, I am sure i will at some point, but am picking up new work at the same time only better priced.