INFO:

Here is the scene in the original Willy Wonka and the Chocolate Factory from 1971 where Wonka and the 2 remaining kids and their parents (including Charlie and his grandfather, Grandpa Joe) ride the Wonka mobile and get blasted with gallons of the liquid foam from the mixture of the all the different sodas that were poured into the vehicle’s fuel tank before reversing the mess from them by being dry cleaned through the magical Wonka wash.