I agree with O_G that the best approach is to use cotton buds and isopropyl alcohol although, obviously, Woodelf's visual handicap would probably mean that he'd need help with such a technique. (NB: Remember to clean the rollers as well as the head).
Otherwise I'd definitely be looking to stick with a 'wet' method of cleaning (rather than the purely abrasive alternative) by using a cleaning cassette that comes with cleaning fluid, such as this:
Amazon.co.uk User Recommendation