Resin build-up on saw blades can hamper fine wood working, especially when working a lot with pine.
New Teflon coated blades reduce that build-up, but to get it off my old stand-by is to put the blade in a pizza pie tin, cover it with Ammonia and then cover that with another pie tin so I don't have to smell it. The next day I can wipe it off with a soft cloth and there is not rust potential with the blade as there can be with solvents, and no fire hazard either.