[ARSCLIST] Cleaning aluminum disks

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I have an (uncoated? i.e., silver colored) aluminum disk from Special 
Collections on campus which I have been asked to digitize. It needs 
cleaning: the surface is dull and fingerprints can be seen (I wondered 
if someone took some cleaner and wiped it!). What you recommend I use?

Also, we are having problems playing it. The needle slips over several 
grooves. Another disk recorded at the same time (sides 1 & 3, as opposed 
to 2 & 4!) played fine. Will cleaning solve this? Or should I do 
something else. We are using a Dual turntable with an osmium stylus. I 
have seen discussion of weighting the tone-arm, but I want to be sure I 
won't wreck it!

Barbara

Barbara Need
Manager