Remember the one from early 60's.. for Soakey Bubble Bath

Soakey soaks you clean in oceans full of fun
Scrubbity bubbity flibbity flubbity clean before your done
Soakey soaks you clean and every girl and boy
Gets a toy when it's empty, when it's empty it's a Toy.

Containers were in the shape of cartoon characters such as
Rockey and Bullwinkle