Resin build-up on saw blades makes them less effective. A clean blade runs cooler, doesn’t cause burning on your workpiece, stays sharp longer and cuts more accurately. Cleaning blades is a chore, however, so I’m always on the lookout for ways to make it easier.
Krud Kutter Cleaner/Degreaser seems to take off resin build-up pretty easily. It’s bio-degradable and non-toxic, but it’s still recommended that you wear gloves when you use it. Just spray it on, let it soak for a minute, and then wipe it off. Tough deposits may take a couple applications and some elbow grease. Krud Kutter Cleaner/Degreaser is available at hardware stores and home centers.