I have a big bottle of pink, strawberry smelling, foam bath that someone gave me about 8 years ago. I keep thinking I will pour it away because it smells sickly, it's obviously a cheap make so I wouldn't want to put it on my skin for fear of turning into a lobster. But if I put it down the sink it might make the whole street froth up if it comes up out of the drain holes.
So I diluted it and put it in a squirty plastic bottle, and it cleans the toilet, bath, and wash basin up lovely.
Ilona