[gmku]

Don't use isopropyl. It has impurities. I use a solution of denatured alcohol and distilled water, about half and half. I keep this in an old D4 Discwasher bottle. I use eyeglass-cleaning cloths (available from good optitiricanists) to wipe this on the record.

I have a far more complicated method for cleaning really dirty records but it's too much detail to go into here. PM me if you're interested.