I have my saw inside the house. It's not really exposed to the elements. I do get oxidation on the cast saw table on occassion even with applying paste wax after a project. I found a trick to remove the oxidation. I noticed my wife using a two sided scouring sponge on pots and pans when cleaning them. I asked her if she had a new clean one. I took the course side of the sponge, applied some paste wax and a little elbow grease and scrubbed the surface. About ten minutes later there was black coating on the sponge. The pad got into all the little machining marks on the table and removed the oxidation. I let the paste wax dry, cleaned it off and the table was shinning again. Reapplied a fresh coat of wax and I'm ready to go again.
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