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FORMULA 420 is a nice safe and cheap solution for removing those stubborn resin buildups. Smaller pieces like stems, bowls and hand pipes can easily be scrubbed and rinsed out. After a good soak, even tiny crevices will get spotless eventually. Cleaning larger pieces like bongs is a little more involved. Use paper towels to plug the joint and mouthpiece of the bong so the mess stays inside. Shake the pipe gently and carefully and watch the FORMULA 420 as it removes the resin inside. After all that dark resin is no longer stuck to the glass, rinse out your bong with water until the smell and taste of resin is gone. Rinse and repeat until you’re satisfied. It’s amazing how quickly a filthy piece can be restored to feel like it was brand new again. Enjoy!