Agree with Acme. I have found that cleaning with a velvet pad and isopropyl alcohol is quite effective for dust removal. To echo what was said above, I have had trouble with some inner sleeves lined with some kind of plastic material adhering to the disc after long storage and leaving marks on the record's surface.

If you pick up a pebble on the beach it can look quite dull, then look beautiful and shiny when you wet it - then go dull again when it dries. Just thought I'd mention it!