I`ve just bought 2x Technics 1210 mk2, second hand, I think they are ok, but they are dusty and dirty as hell. Can dust cause some problems, is it necessary to clean them, and how do you do it? I`m not familiar with this, so I`m affraid not to break something. Tonearm is dirty, And I think under the platter is a lot of dust. Any advice how to clean them and with what? Thanks.