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Personally, I don't think it's likely that you're to blame.Double glazing doesn't last for ever and the quality of the units may differ.How old are the units with the blown seals? I bet they're about 15 years old.Point them in the direction of your local 'Window Doctor'; I've heard they're good (you can find them in the Yellow Pages). They'll remove the window, clean it up, replace the seals and put the window back in.
one o my custys windows have gone after 6 months, a downstairs window that i have cleaned trad 5 times since she has had them in, windows that dont get cleaned also do this...
I am trad and I have some customers that have this on there window, it is the seal that is broken on the double glazing and allowing air to flow between the pains causing condensation as the cold air hits the warm glass, or vice versa. Unless the brush is breaking the seal but this is unlikely.
The upvc frame surrounding the glass unit has a concealed drain which is routed into the plastic, so even if pure or rain water gets in it should drain away automatically.