Actualy , with interior latex on a floor all he has to do is dampen a
dropcloth with soapy water for apx 4 hrs or so. And wash off. Goof
off is 5 times the price of denatured alcohol, has some volitile
chemicals in it . And as far as running any kind of buffer on sheet
goods, I would not waiste the money or risk ruining the finish, If he
does it wrong , he is screwed. Keep it simple.