A cleaning cassette for high speed cassette records has a cassette case dimensioned to correspond to a magnetic tape cassette operative in the particular recorder, a cleaning tape guided in the cassette case, the cleaning tape movable from a supply reel to a take-up reel across an area corresponding to a magnetic head of the cassette recorder. The take-up reel remains accessible when the cleaning cassette is in place, defining a manually-operable drive means for manual transfer of the cleaning tape from the supply reel to the take-up reel during cleaning. The cleaning tape is manually passed over the heads at a slower speed than an operative speed of the magnetic tape cassette for better cleaning and less head damage.