Magic dish rag?
He says you can leave it in your kitchen so when you got some friends round you can impress them.
How many times have you called all your fucking guests into your kitchen during a dinner party?
The whole idea is just a bit crap. Would have made an OK magazine piece at a push - "Hey Genii readers here's a gay idea, make a devils hank out of an old dish rag and then have a party and impress people by vanishing a small object inside it".