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Rotate the upper cylinder be hand in order that the heads brush up towards the moist chamois. Gently hold the flat portion of the chamois against the higher cylinder where it's joined to the lower (non-rotating) cylinder. With one hand, GENTLY hold the surface of the patch/swab towards the video drum, with just barely enough stress to hold it there. Take the patch away, check to see how much oxide and dirt got here off, flip it to a clean spot, hold it against the drum once more, and rotate the drum a couple of more instances. Don't flood it as it can take a long time to dry and also you run the risk of any water within the alcohol sitting on surfaces and leading to rust (very unlikely, but don't take the chance). So get out there and take motion. It's a query worth posting: Just how dirty can a shower curtain get?