I'm a cheapskate. I wash used records in tepid tap water containing a little dishwashing liquid with a lint-free cloth. I then rinse them thoroughly with copious tepid running water and allow them to drip-dry in a rack for a while. Finally I pat them dry with a fluffy lint-free towel. I get excellent results for virtually zero outlay. Sometimes a noisy region can be heard after washing, but a second washing has always remedied this..

I've tested my method in two ways. Firstly I washed a brand new record of no musical interest to me and heard no discernable change. Secondly I took a 2-record box set, and washed one dirty record by my method. The second record was cleaned by a local retailer who has a Keith Monks vacuum machine for $10. Nobody who has listened to these can hear any significant difference.

I know this breaks all the rules. But it works.