Here is the situation: Restaurant tables, previous finished with spar varnish. During use, they have been spilled on with oily food, water, you name it. They need refinishing OVERNIGHT. Light sanding seems to leave a residue of oil which causes the poly to lay down unevenly. Deep sanding removes everything ... but I would like to avoid it because only one light overnight coat is hardly enough. Question: Can I use acetone and a steel wool pad to scrub the oil off the lightly sanded surface? Letting it flash off (fast) I would then apply poly with a brush leaving the table top to cure under heat lamps overnight. The resulting coating would be thick enough and the oil would be gone. Is acetone the best choice or mineral spirits?