You know, they suck up water, and of course after a while when you sqeeze them out this crud comes out too . I am a FT mum, I am trying to get back onto the cleaning thing (what IS a Hot Spot)and the lists and organisational skills of some of you are amazing..you'd not think there were children in the house hampering all your efforts too. So, help me clean my bathroom please - cleaning the toyss, what other thing should I be doing, other than the usual wipe round and brush-down-the-loo thing?