Pure Isopropyl Alcohol 99.9% (500ml) Review

Isopropyl alcohol has been the go-to bong cleaner for decades, and there's a reason it's still the standard — it works, it's cheap, and it's everywhere. The key is getting 99.9% pure. The 70% surgical spirit stuff contains too much water to be truly effective. At 99.9%, it dissolves sticky cannabis resin almost instantly. It's proper alchemy.

The Salt & Alcohol Method

Here's the recipe: pour 100ml of 99.9% IPA into your bong, add 2 tablespoons of coarse salt — Epsom or sea salt works best — plug the openings, and shake vigorously for 30–60 seconds. The alcohol dissolves the resin while the salt physically scrubs it off the glass. Rinse with warm water and your piece comes out looking brand new. It's cost-effective, it's simple, and it works better than most fancy commercial cleaners.

Where IPA Really Shines

Vaporiser stems, glass chillums, downstems — drop them in a jar of IPA for 1–2 hours and the resin dissolves completely without any scrubbing. Heavily soiled pieces? Leave them overnight and they come out like new. At £4.95 for 500ml, this is the best value cleaner on the market by a wide margin.

Concentration and Safety Notes Worth Respecting

Buy 99.9% or don't bother — the weaker surgical-spirit strengths carry too much water and leave you shaking a cloudy bong for twice the effort. I treat this bottle with respect every time: windows open, no naked flames anywhere near the sink, and gloves on if my hands are already dry or cracked. It will haze acrylic and dry out silicone seals, so I keep it strictly to glass, metal, and ceramic, then rinse everything thoroughly with warm water until the sharp smell is gone. Vape stems and cooling units get the same treatment — a soak, a rinse, and a full air-dry before anything goes back together, as our vape cleaning guide walks through.

IPA and Salt vs Formula 420: My Honest Head-to-Head

I own and use both, so here's the straight split. IPA and salt at £4.95 wins on price per clean by a mile and handles soaks beautifully — drop small parts in a jar and walk away. Formula 420 wins on speed and convenience: a single shake-and-pour with no measuring, no salt, and no overnight wait. On a neglected perc piece, Formula 420 gets there faster; on a weekly-cleaned beaker, I genuinely can't tell the difference in the final result. My setup is both on the shelf — IPA for routine soaks, Formula 420 for the quick turnaround before guests. See how they stack up in our best glass cleaners UK roundup.

Who Should Skip It

Be honest about your habits. If you hate measuring, shaking, and rinsing, you'll never stick with the salt routine — pay extra for a pre-mixed cleaner you'll actually use. If your whole setup is acrylic or silicone, this bottle is actively wrong for you and will damage your pieces. And if you live somewhere with no ventilation and no outdoor space, the fumes will make every clean miserable. For everyone with glass on glass and a window to crack open, though, nothing touches it for value.

Isopropyl Alcohol FAQ

Can I use 70% surgical spirit instead of 99.9%?
You can, but I wouldn't. The extra water content makes resin dissolve far more slowly and leaves spotting on the glass. For the same money per bottle, the 99.9% strength finishes the job in a fraction of the time.

Is it safe on my vaporiser parts?
On glass, metal, and ceramic stems and mouthpiece parts, yes — soak, rinse well, and let everything dry fully before reassembling. Keep it away from plastic housings, rubber seals, and anything with a battery or electronics.

How do I clean a full bong with it?
Pour in the alcohol, add coarse salt, plug every opening, and shake in short bursts until the glass runs clear, then rinse thoroughly. The full step-by-step is in our bong cleaning guide.