Hi, does anyone have experience of using mineral deposit remover?. I bought some ages ago, but was a bit wary of using it, especially on newer houses which may have one of those insulating films on the glass. The instructions on the bottle says to use it with fine wire wool, this did nothing to ease my reluctance to use it!. But I am noticing mineral deposit on quite a lot of customers houses, so was thinking that maybe I should stop being a wuss and get on with it!. Any comments, hints, and brand recommendations gratefully received!.