Bong?

I too would love to know secrets. Especially cleaning the widest part of the bottom. Tried a bottle scrubber and ended up scratching it a bit and couldn’t reach the crud. Maybe let it soak with alcohol overnight
 
Methylhydrate aka Meth-spirits aka Methyl-alcohol aka Wood Alcohol aka gas-line antifreeze.

Yes, it's toxic, and highly flammable. It also evaporates quickly, and no, it doesn't leave residue. It's water soluble, so after cleaning, let it dry, then rinse with plenty water.

A big jug at a hardware store will cost $10. Do it outside or under a vent hood.
 
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