On the other hand, if the table is filthy and worn but not torn, and your receipts are down for the summer so recovering is months away, and the slate is a one-piece, and last night someone doubled the total area of the beer stains, a good washing could actually help.
I played in one carom room where the cushions were a "little dirty" and if you ran your finger nail along the nose, you would get dirty grease under your nail. Really. Usually carom tables are kept better than pool tables, because the cushions and cloth affect every shot. That room could have used some soap and water and not just for the tables.