Quick Answer: Iso alcohol (90%+) and coarse salt is the standard method for glass — fill the chamber a third, shake, soak 30 minutes, rinse. For something easier, LimPuro Bio Bong Cleaner (£5) does the job without the scrubbing. We’re the only UK distributor. Jump to the LimPuro section →

We’ve all seen it.

The glass has gone black. The bowl looks like it’s been dug out of a chimney. The downpipe barely pulls. The water has turned into something that should probably have its own postcode.

At that point, there are only three questions worth asking: can you clean it? Do you need to replace a part? Or has the poor thing had it?

We’ve sold bongs, pipes, bowls, downpipes, screens, cleaners and spare bits for years at Willy Banjo, and one thing is obvious: most people leave cleaning far too long.

We’re not judging. Well, maybe a bit. But only because once it’s black, it’s minging.

The quick test: clean it, replace a part, or bin it

Before you start attacking everything with boiling water and hope, have a proper look.

If it is just stained, sticky or clogged with residue — clean it.

If the main piece is fine but the bowl, downpipe, gauze, seal or screen is past its best — replace the part.

If it is cracked, chipped, cloudy beyond saving, smells wrong even after cleaning, or looks like it has survived a small house fire — it might be time to let it go.

That is the basic rule. Clean the grime. Replace the tired bits. Bin the lost causes.

Clean it: glass bongs, pipes, bowls and downpipes

Glass usually cleans up better than people expect. Even when it looks grim, a proper clean can bring it back. But “proper clean” means more than a swill under the tap.

The method that actually works

  1. Empty and rinse. Tip out the old water. Rinse the chamber with warm water to shift loose material. Do the same with the bowl and downpipe.
  2. Disassemble. Take out the bowl and downstem. Clean them separately — they need attention on their own, not swimming around inside the main chamber.
  3. Coarse salt + iso 90%+. Fill the chamber about a third with isopropyl alcohol (90% or higher — 70% works but takes longer and needs more soaking). Add a good amount of coarse salt. The salt is the abrasive. The iso breaks down the resin.
  4. Plug and shake. Cover the mouthpiece and the downstem opening. Shake for 30 seconds. You should see it coming off.
  5. Soak. Leave it for 30 minutes. Fresh grime shifts quickly. Heavy build-up needs longer — an hour, or overnight for the really dark stuff.
  6. Scrub. Pipe cleaners for the downpipe, bowl and any awkward bends or percolator chambers. Get into the bits the shake didn’t reach.
  7. Rinse thoroughly. Warm water, several passes. No residue left — iso and salt both need to be completely out before use.
  8. Air dry. Don’t put it away wet. Moisture sitting in a sealed bong breeds mould faster than you’d think.

Bowls and downpipes: same method, smaller scale. A bowl goes in a zip-seal bag with iso and salt, shake it, leave it 30 minutes, rinse.

Percolators and ice catchers need more patience. The extra chambers are harder to reach — longer soak time compensates for less shake. Pipe cleaners get into the tight spots.

The easier option: LimPuro

We’re the UK’s sole distributor of LimPuro, a German biodegradable bong cleaner range. We stock it because it works, and because being the only place in the UK to sell it is worth making use of.

The difference from iso and salt: LimPuro is purpose-made, not a repurposed solvent. It has a self-cleaning action — pour it in, shake, leave it, rinse. No scrubbing required for most jobs. Biodegradable, so you can pour it down the sink without worrying. You’ll find the full range on our bong and pipe cleaners page.

The one to start with is the Bio Bong Cleaner at £5. It handles most jobs. Grab the King Wipes alongside if you want something portable.

Replace a part: bowls, downpipes, gauzes and screens

Sometimes the main piece is fine, but one little part is ruining the whole thing.

Bowls get clogged. Downpipes get grim. Gauzes and screens wear out. Rubber seals perish. Little glass bits get chipped, dropped or mysteriously vanish after someone says, “I’ll be careful.”

If your bong is not pulling properly, check the bowl and downpipe before blaming the whole thing. A fresh gauze or screen, a new bowl or replacement downstem, can make old kit feel much better without replacing the lot.

This is especially true if you have a glass bong you like. Don’t bin the whole thing just because one removable bit has gone minging.

Bin it: when it has actually had it

Some things are not worth saving.

Cracked glass is the obvious one. If it is cracked, chipped around the mouthpiece, leaking, or has sharp edges — retire it.

Cloudy acrylic can also be a sign it has seen better days. Acrylic bongs are handy, cheap and tough, but once they are scratched, stained and holding smells no amount of rinsing can shift, it might be time for a new one.

Also, if you have cleaned it properly and it still smells wrong, looks wrong and feels wrong — trust yourself. Some kit has simply done its shift. Thank it for its service and move on.

What you need for a proper clean

You do not need a full science lab. Here’s what’s worth having:

Avoid anything that might scratch glass. And don’t force stuck parts — if a downstem is jammed, warm water and patience, not brute force. Snapping it off because you got impatient is a very Preston way to turn a cleaning job into a shopping trip.

Quick rinse vs proper clean

A quick rinse is what you do before it gets bad. Empty it, rinse it, swill warm water through, clear loose bits from the bowl and downstem. Done regularly, this stops it getting grim as quickly.

A proper clean is what you do when the quick rinse is no longer fooling anyone. That means cleaner, brushes, pipe cleaners, taking removable parts out, giving the bowl and downstem proper attention, and rinsing everything thoroughly afterwards.

If the water has gone brown, you’re late. If the glass has gone black, you’re very late. If it looks like canal gravy, stop pretending it is fine.

Common mistakes people make

The biggest mistake is leaving it too long. A bit of fresh residue is easy to clean. Old, baked-on grime is a different job entirely.

Other classics: using 70% iso when 90%+ is what you need (takes much longer, often doesn’t finish the job properly); using the same gauze forever; ignoring the downstem; cleaning the main chamber but leaving the bowl minging; rinsing once and calling it done; putting dirty parts back into clean glass; trying to save cracked glass; buying nice kit and treating it like a wheelie bin.

We have seen all of these. More than once.

How often should you clean it?

This depends how often you use it, but a simple rule works: change the water often, rinse before it looks grim, and clean properly before it goes black.

If you use your kit regularly, a quick rinse should be normal, not a special event. A proper clean every so often keeps everything working better and stops it becoming a horrible job later.

The longer you leave it, the more annoying it gets. That is true of bongs, washing up, vans, stockrooms and most of life.

Clean it or bin it — FAQ

What’s the best way to clean a glass bong?
Iso 90%+ and coarse salt is the standard method. Fill the chamber a third, plug the holes, shake 30 seconds, soak 30 minutes, scrub with pipe cleaners, rinse thoroughly. Or use LimPuro Bio Bong Cleaner (£5) — shake and rinse, no abrasive needed.

Does it have to be 90% iso, or will 70% do?
70% works but it’s slower and needs a longer soak to break down resin properly. 90% or higher cuts through faster. If you can get 99% from a pharmacy, use that. The difference is noticeable on heavy build-up.

How long should I soak it?
30 minutes for normal grime. An hour for heavier build-up. Overnight if it’s been a while and the glass has gone dark. Percolators and ice catchers need longer because the liquid can’t be shaken as effectively through tight chambers.

What’s the difference between LimPuro and iso and salt?
Iso and salt is an abrasive method — the alcohol dissolves resin, the salt scrubs it. LimPuro is a purpose-made biodegradable cleaner with a self-cleaning action — shake, leave it, rinse. Both work. LimPuro is easier and kinder to the drain. Pipe Limo (£4.99) goes in before you smoke and reduces build-up, so either method is less work next time.

Can I clean a silicone bong the same way?
Yes, with some changes. Skip the salt — it’s not needed for silicone and can be awkward. Iso works fine. Silicone parts (bowls, downpipes) can go in the dishwasher on a low cycle if you want the easy option. LimPuro Bio Cleaner works on silicone too.

When is it time to bin it rather than clean it?
Cracks, chips around the mouthpiece or joint, anything leaking or with sharp edges — retire it. If it smells wrong after a proper clean, it’s had it. Acrylic that’s gone cloudy, scratched and is holding smell through the plastic itself is done. If it pulls wrong even with a clean bowl, clean downstem and fresh screen, check for hidden cracks before assuming the whole thing is beyond saving.

Shop cleaning bits and spare parts at Willy Banjo

We stock LimPuro Bio Bong Cleaner, King Wipes, Grinder Cleaner, RAW Pipe Cleaners, gauzes and screens, spare bowls and downstems, and the rest of the bits people forget they need until they need them.

If your glassware is just dirty — clean it. If the bowl or downstem is past it — replace the part. If the whole thing is cracked, cloudy, leaking or properly minging — maybe it is time for a new one.

Either way, don’t leave it until it looks like it has been dragged out of the Ribble.

Willy Banjo is at 13a Lowthian Street, Preston, and online — still here, still selling the bits people forget they need, and still telling you when your kit needs a clean.

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