Isopropyl alcohol at 91% or higher plus coarse salt removes bong resin in about 10 minutes. Fill the tube until the alcohol covers the resin. Add 1 to 2 tablespoons of coarse salt. Cap both openings and shake for 30 seconds. Let it sit 5 to 10 minutes, shake again, then rinse with warm water. That routine handles a bong used once a day. Thick resin in a percolator needs a 30-minute soak, and a heavy buildup needs an overnight soak.
What resin is
Resin is the residue left when cannabis burns. It holds tar, ash, and plant oils. It sticks to glass, coats the walls, and narrows the airway. A clogged downstem pulls harder and moves less smoke per hit. Resin also carries the smell that stays in the piece and in the water.
Supplies
- Isopropyl alcohol, 91% or 99%
- Coarse salt, kosher or Epsom
- Two rubber stoppers or a res cap
- Pipe cleaners, 6 to 12 inches
- Warm tap water
- Dish soap for silicone and acrylic
Step by step
- Empty the water into a trash bag, not a sink. Ash and resin clog drains.
- Rinse the piece with warm water to loosen surface buildup.
- Pour in alcohol until it covers the resin.
- Add 1 to 2 tablespoons of coarse salt. Salt does not dissolve in alcohol, so the grains scrub the walls.
- Cap both openings and shake for 30 seconds.
- Wait 5 to 10 minutes. Shake again.
- Pour out the alcohol. Rinse with warm water until the smell is gone.
- Run a pipe cleaner through the downstem and the bowl.
Materials that need other methods
Acrylic and plastic cloud or crack when alcohol touches them. Use warm water, dish soap, and a soft brush. Silicone takes alcohol and soap. For electronic pieces, remove the battery and keep liquid out of the coil and the airway. Salt leaves grit in small percolators, so rinse twice.
How often
Daily users see resin build in 3 to 7 days. Change the water every session. A 10-minute alcohol wash once a week keeps airflow at full. A bong with a percolator needs a 30-minute soak every 2 to 3 weeks.
clean bong with vinegar and baking soda
Safety
Isopropyl alcohol is flammable. Keep it away from flame and from a lit bowl. Work in a room with open air. Do not drink it. Skin contact causes dryness. Do not heat alcohol in a microwave. Hot glass plus cold alcohol can crack a piece, so let the glass reach room temperature first.
Do not dab the resin
Bong resin holds tar and ash. It is not the same as reclaim from a vaporizer. Heating and inhaling it adds back the compounds the water filtered out.