I run a from-home business selling Bath Sprudels which are kid's bath bombs that colour their bath water as well as have a surprise sponge shape in the centre. The excitement of watching the ball fizz and seeing what sponge shape is revealed will get your kids into the bath with no fussing, and want to stay in playing with all their different sponges! They are sold in individual boxes or in boxes of 6.
I also stock Sand-Off Mitts which are gloves that remove sand off a wet or dry child or adult. There are no chemicals involved with only natural products being used. No more carrying half the beach home or spreading it through the car!