The One Table Saw Rule: Only wood goes on the table top!
Unfortunately not everyone follows the rule that only boards to be cut go on the table saw surface. The table saw I purchased has clearly been used as a coffee table coaster and painter's booth. The beverages must not have sat for long because the rust is only surface deep and will polish out with some steal wool. The paint and glue stains will need to be scraped with a soft metal tool. In my tool set I have a tool that looks like a wide headed flat screw driver. I picked it up at Sears for scraping away the remainder of a head gasket. This tool works great on the cast iron because it was designed so it wouldn't scratch aluminum. With patience and careful motions I cleaned away the stains and polished out the scratches. Some discoloration remains, but the surface is smooth so there will not be friction between the table top and the boards being cut.