A dirty bong doesn't just look bad — it smells worse and hits harsher, as resin buildup filters out flavor while doing nothing for smoothness. The good news: cleaning one properly takes about 15 minutes and doesn't require anything exotic. Here's how to do it right, whatever type of glass piece you've got.
What You'll Need
- Isopropyl alcohol (90%+ — the higher the concentration, the faster it cuts through resin)
- Coarse salt (regular table salt or Epsom salt both work)
- A sink or large basin
- Ziplock bags or plastic wrap (to seal openings while soaking)
- Pipe cleaners or a bottle brush for tight spots
- Warm water for the final rinse
Step 1: Empty and Disassemble
Pour out any standing water first. Then take the piece apart — remove the bowl, the downstem, and any removable percolators. Cleaning each part separately gets into corners a whole assembled piece never will.
Step 2: Salt + Alcohol Soak
This combination is doing most of the work. The alcohol dissolves resin; the salt acts as an abrasive that scrubs it loose as you shake.
- Add a generous handful of coarse salt into the base and each removable part.
- Pour in isopropyl alcohol until the resin-covered areas are submerged.
- Seal the openings (bags or plastic wrap + rubber bands work well) so nothing leaks.
- Shake firmly for 1–2 minutes, focusing on the areas with the most visible residue.
- Let it sit for 10–15 minutes for heavier buildup, then shake again.
For stubborn spots — especially inside percolators with tight slits — a pipe cleaner or bottle brush dipped in the alcohol mixture helps you reach what shaking alone can't.
Step 3: Rinse Thoroughly
Rinse every part with warm water until no alcohol smell or salt residue remains. This step matters more than people think — leftover isopropyl alcohol taste is unpleasant and, more importantly, you don't want to be inhaling it.
Step 4: Dry and Reassemble
Let everything air dry fully before putting it back together — trapped moisture is where mold starts. Standing pieces upside down on a towel speeds this up.
How Often Should You Clean It?
As a rule of thumb: a quick water change after every session, and a full salt-and-alcohol clean once a week with regular use. Glass pieces with percolators need it more often, since the extra chambers give resin more surface area to build up on.
A Note on Glass Quality
Thicker, higher-grade borosilicate glass handles the shake-and-soak method without the durability concerns that come with thinner or lower-quality glass. If you're cleaning an older or delicate piece, go gentler on the shaking and skip hot water, which can cause thermal shock in glass that's already stressed.
Final Tip
Cleaning is a lot easier — and needed less often — if you're using an activated carbon filter in the first place. It's the same principle behind our PURIZE filter guide: less tar and residue getting through means less buildup to scrub out later.