I had an Oldham blade in the table saw that wasn't cutting well--tended to burn and leave rough surfaces. I'd cleaned it as thoroughly as I could and it didn't help. I was about ready to send it out for sharpening, when I had occasion to cut a piece of UHMW polyethylen. Well, it didn't do the greatest job on the UHMW, but ever since it's been cutting wood just as cleanly as when it was brand new.
Cutting UHMW may not be the cheapest or neatest way to clean a blade, but it seems to have done the job really well.