Even though vinyl has regained a little market traction in recent years, the accessory business hasn't. If you're a collector who enjoys digging through crates of old and scratched LPs, you've probably found some dirty ones in need of cleaning, and Instructables user bfk has a simple and cheap solution.
You'll need to build a small wood block with a strip of plastic attached, but the crux of the cleaning comes from removable putty wrapped around a small bar. The block is used to roll the putty across the record, picking up dirt, lint and everything else. It's a simple way to make your records clean and better-sounding, especially considering other options like wood glue or building a whole machine take a lot of time and effort. Theoretically you could skip the wood block part, but it might end up picking more grit off your hands then the record itself. Find the full guide over on Instructables.
Block and Bar Vinyl Record Cleaner [Instructables]