Hot hot water, 2-3 cups vinegar, good squirt of blue dawn dish soap. Let sit for 30-45 mins.
DIY Network shows you how to use vinegar and tea tree oil-based solutions to clean the inside and outside of your kids' bath toys.
How & Why to Clean Bath Toys. I've always wondered how to do this because they mold on the inside.
Tricks & Tips
Clean your kids toys in the dishwasher with vinegar! Use 1 1/2 - 2 c. white vinegar. (And recipe for spray to clean wooden toys and others that can't go in the dishwasher.) Via Lilac City Momma
clean :: diy cleaners
How to clean bath toys naturally WITHOUT bleach
We Love Being Moms!: How to Clean Bath Toys! Plus, glue holes closed once toys are clean (or when you first get them).
Home - Natural
bath toy storage
How to clean bath toys
How to get mold out of kids bath toys: soak in pure white vinegar, leave for at least 1 hour, rinse well.
How to clean bath toys | Easy way to get all the black yucky gunk off bath toys and keep them clean! | Daisies & Pie