If I were you, I'd call VPI. If there is a coating on it (mine doesn't LOOK like it's coated) you might be sorry in the end. I found that FLITZ is wondeful polishing cream for metals. ( I use it on my Porsche)
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I had an aluminum platter and used Wenol Metal Polish (Purchased through Amazon. You can also read the reviews). My mother has used this on metals for years. The results produced a high luster.
Agree with Stringreen, check with VPI is there is a coating on the aluminum. Otherwise, give the Wenol a try on the underside of the platter, first.
Just a follow up. The whole polishing process took less than 15 minutes and only required a gentle rubbing. Just make sure that you have a good supply of micro fiber cloths as quite a bit of black tarnish is removed.
Just like how a washed and waxed car drives better, my TT sounds better with a polished platter :-)