I recently bought an Amiga 2500, barebones with just a PSU, Floppy and mobo from Redrumloa on Amiga.org. He said there was a replacement battery fitted, but the original left that evil greenish acid. The sound, which doesn't work, is probably either a bad paula or CIA. I have dabbed IPA on the residue, but it rips my q-tips. What is a better "cloth" to clean it?