Boring I know but its bugging me...
We have 3 in the bathroom and put them in a mug in the bathroom cabinet. Because we put them away wet, after a few days they sit in a pool of yucky water in the bottom of the cup. I suppose I should just wash it out everyday or dry them on a towel but I'm a slattern and forget. I dont remember having this problem before. So, how do you store yours?