My mom uses a walker, and has been putting tennis balls on the bottom of it to stop it from scuffing her floors, but she seems to go through them quite often, so I was wondering if anyone knows anything else that might work? She lives in housing for the elderly, so she's worried they might say something if she gets it too scuffed up. She has a lady who comes in and cleans, but she said the scuffing is difficult to clean up. Thanks!