You may want to wear latex gloves, as the smell of resin can be hard to remove from your hands. [1] X Research source
Do not use hot water on a cold piece, as this can cause it to shatter. If your piece is cold, for whatever reason, start with lukewarm water and slowly raise the temperature. For smaller, routine cleanings, you can just rinse out the bong quickly and move on to further cleaning.
For smaller pieces with tough, thick stains, like your slide or bowl, it can help to freeze the piece for 30 minutes. This loosens up chunks of resin and makes them easier to knock off. Be sure to dry the bowl before freezing.
You can also use cups and bowls, as long as you can fill them with enough liquid to cover the pieces. However, cleaning may leave an unsavory smell to the cookware, making plastic bags the most convenient option more often than not.
Professional cleaners like Simple Green and Solution 420. Hot water and denture tablets. [2] X Research source
You can remove the piece and use a cotton swap to wipe away any stains, which should come off easily, before soaking the piece again. Some of the salt has likely dissolved since the other 9% of the isopropyl is water. Add more if you need.
If you’re eyeballing your measurements, simply add as much alcohol, and in all the same places, as you would add water if you were smoking.
Don’t worry if you can’t get the salt everywhere just yet – it will be easier when you start shaking.
For a deep clean, you may have to rotate and turn the bong in order to get the salt to hard to reach areas.