just got an email from a customer that have a shopfront which I clean trad every 14 days outside, never inside cleaning. He told me that I've jumped the top window and didn't hope that it was to be a habit to do so ... "What are you talking about" I thought . Then I kindly explained to the dear manager that the shop windows are about 50-60 years old , and they are DIRTY on the inside( maybe 5 years since or more ). I could assure him of the fact coz I've noticed it myself every time. , now because of all the Christmas lighting he just got aware. Bet you got these types too huh!?