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yep its works but I just use an old thong (flipflop, jandal for the oz illiterate) for the same result.
For UK members, these are good in my experience.https://www.screwfix.com/p/titan-abrasive-belt-cleaner-76mm/16210
A number of years ago when visiting a friend with a small woodworking shop i noticed that he cleaned his belt sander using old tightly twisted plastic bags, twisted into a sort of stick.