We had a glass bath shower screen fitted about 18 months ago and are really delighted with how much smarter the bathroom now looks. We have been meticulous in keeping the screen clean, wiping it down thoroughly on a daily basis to keep it looking gleaming. The problem is getting into the corners of the silicon at the bottom of the screen, that seals the space between the screen and the bath and over the months, the edges have started to accumulate "gunk". We've tried to get at it with cotton wool buds and even a cocktail stick, with kitchen roll wrapped round, but can't quite get into the very corner edges to clean it out. Any hints? We'd be very grateful. Many thanks.