Over time different woods will clog power carving burs. Some will clog easier than others, and if you add glue or epoxy to the mix, they'll clog even faster. Some carvers will soak their bits in caustic substances like acetone or oven cleaner, while others resort to a butane or propane torch to burn out the wood - all of which will damage your expensive bits.
This bur cleaning system gently removes sawdust and char using ultrasonic technology to preserve bits. Add water and a few drops of dish soap to the ultrasonic cleaner to remove most sawdust and char. For tougher clog, add Magic Green to the ultrasonic cleaner and let it dissolve overnight. Run the bit through the cleaner a few times to loosen the char and grime, then brush it gently with the brass brush. For tough glue and epoxy, soak the bit in Attack Epoxy Dissolver, carefully remove the bit from the solution (wear fluid resistant gloves), and brush as needed.