Wipe down top with rag dipped in paint thinner, mineral spiriys or naphtha. Then wipe down with a clean rag dipped in a solution of 1 -2 qts water and a few drops of dishwashing soap - like Dawn. Wipe dry.
You can then light sand the surface with a 220 grit paper and vacuum dust. Then apply 3 coats of a waterbase wipe on, gloss poly. I'd dilute the first coat about 2 parts poly to 1 part water. Let dry. and follow directions on can with regard to recoat times.
Bob "Boardman" Borders