Save Money By Knitting Your Swiffer Refill

I subscribe to my friends feeds over at Ravelry and look at what popped up today! Like most people nowadays, I try to save money where I can and I am a big fan of Swifter type mops. But the refills are very expensive, so apart from devising our own cheaper cleaning solution I think this knit mop refill pattern over at The Fickle Knitter will be perfect! Those refills are not cheap either. The bumps in the stitches should provide the needed friction and now that I think of it, I may modify the pattern to be garter stitch for more friction. When done I can simply wash the wool in the sink or bucket. Has anyone tried this? Do you think making it in garter stitch is a better idea?