Dry cloth....anything else will remove the "rub and buff" which is a wax product.

thanks lindac92! Could you seal it with a varathane?

Rub and buff is wax....you can't varnish over wax.

to lindac92 and other Rub n Buff users, I thought I would share this information about sealing R n B and I think then maybe you don't have to worry about cleaning it. (I do appreciate your words of "caution".) Found this on Pinterest

http://renewredo.blogspot.ca/2012/01/rub-n-buff-tips-and-tricks.html

She talked to the manufacturer and found out what to seal it with.