What (if anything) does your older toddler/preschooler do or play with in the bathtub?

My girls (almost 2 and 4) play with cups and squirters...they have a fishing set that they don't really like, and a net/wind up bugs that also don't get much play. Looking for new ideas - especially things that are easy to clean (ie go in the washing machine or a bucket of diluted bleach solution to kill mold). Doesn't have to be intended for the bath - I was thinking of designating a pair of babies or barbies as bath toys.