Bit of a tenuous link but here goes...
In the 70's my mum was having the render patched on our old house & my brother and I were told (you did as you were told in those days) to labour for the builder to keep the cost down, after several days up the dodgy scaffold hacking off the old stuff and chatting as you do, the builder realised we were into Mini's (and rust) so we swopped his Austin 1800 into the garage gave it a sand down, a dab of flesh eating Jenolite and amateur re-spray so he knocked some money off mums bill