how long do you leave the bleach/loo cleaner down for? My bottle of bleach recommends to leave it overnight but i always remember reading somewhere that its dangerous to mix bleach with urine so i don't like to do this just in case one of the childrens gets up in the night to use the loo. Then this afternoon i squirted some down and the OH went and used the loo and flushed the bleach away literally two minutes after i left it bloody typically. We don't have any major limescale problems where we live thank god, but even though i'm not OCD i do like to feel its had time to kill all the yucky germs and bacteria down there. I mwan does it really take all night for the bleach to work or can anyone recommend me a good time to clean the loo?