K.P.
They are tough to get out of the grout. My nieces got them as a gift and my sister "lost" them pretty quickly after they were open because her grout (including the floor tiles) is tie-dyed now!
My son had a blast with rubber duckies, little "squirt" toys, cups and a suction cup net that attached to the tub with little basketballs to toss in. All of the above are dishwasher safe and "chewable"... not so much with those bath crayons!