I've been window cleaning a long time now and thought I had seen it all but I heard something new yesterday. I picked up a new customer, well she picked me up really, she stopped me in the street. She's fussy, I know that and she told me she had just sacked her present window cleaner because she wasn't happy with him. She also said that her previous window cleaner before that used to polish the white sills with Mer car polish a couple of times a year. I have to say her sills are in very good condition. Has anyone else ever heard of this?