Actually this thread is pretty good some taking it seriously and others well just...... Dicking around which I do smile at your answers
Mate used to work for Hewitts Refractories who made the bricks for storage radiators. The clay contained metal particles and that ruined serval washing machines before his wife said "no more". He then got a dolly tub and peg and it did an amazing good job of getting his overalls and work clothes clean. He'd sit in front of the TV in the kitchen at night with it between his legs !