As far as cleaning without a RCM, the best way appears to be a hand-held steamer and wipe down with microfiber clothes. There are 2 extensive steam cleaning threads here on audiogon that detail this as well as videos on you-tube. I'm using steam and Disc Doctor fluids with a VPI 16.5 and get great results. Others report similar results with just the steamer and microfiber cloth. The other big trend currently are the enzyme solutions from AI, Walker and now MoFi which I have yet to try due to cost, the increaded time they require, and my natural skeptisism (in the case of AI and MoFi) that enzymes will remain active when held in solution for longer than a few hours.