The Matrix essentially has an unfinished top, unfilled glass with a spray finish on top to save weight, but the fiberglass will still absorb water an look milky.
The bottom and the rails are finished with fill coats. You will probably notice a line on the rails where it becomes smooth. The best part is P5 actually markets unfinished work as a feature..... If the black marks are persistent use a little rubbing alcohol. Any car polish will work as well.
The SC, will be a pure sand finish or a sanded rub on/spray top finish. Magic eraser will work, or soft soap, or any mild abrasive. You will not damage the board. Ideally rub from nose to tail to keep with the sanded pattern..... A light wet sanding with soap will clean up your board like new from all sorts of grim that accumulates over time.
That said, most people don't clean their boards. But it is nice to see you care enough to want to clean them.
Nick
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