Writing
There is a washing machine! You drop the sludge into the bath, clog a hole in the bath and turn the empty machine without powder to the maximum temperature. And we have a depth of 50 liters of water at a temperature of about 80 degrees, and a hot bath - about 50 degrees. That is, we dilute what leaked out of the machine with cold water, and the bath is ready!"
Have you offered a Nobel yet?