Vinegar and baking soda is a science experiment turned bong cleaning method.
Here is what you will need:
Large pot, big enough to completely submerge your bong or bowls
4 cups white vinegar
2 cups baking soda
Toothbrush or pipe cleaner
Gently set the bong inside the large pot and pour one cup of baking soda into the neck. Shake it around into the various crevices, especially the grimier bits.
Next, pour two cups of vinegar down into the neck channel. Instantly, this mixture will fizz up to loosen the resin. You may wish to swish around to get into the hard to reach areas. Allow to subside and let the bong sit for five to ten minutes.
Add remaining vinegar into the pot, then fill the pot with enough water to cover the bong completely. Add the remaining baking soda. Slowly bring the water to a simmer over low heat. Over the next hour, continue to simmer, which will dislodge the remaining gunk. Keep topping up with water to ensure the bong is always covered.
Once the resin has loosened, remove it from heat. When it's cool enough to touch, use the toothbrush to finish cleaning the glassware.
Denture tablets like those you may have seen from 1990's television commercials are making a come back as bong cleaners. Just like they break apart built-up plaque on dentures, they can help break up resin and particles on your dirty bong. Plus, unlike isopropyl alcohol, they are readily available at all supermarkets and drug stores.
You'll need the following items to get started:
4 to 6 Denture tablets
Begin by placing a few tablets inside your dirty bong. Place the bong inside the large pot, and toss in a few more denture tablets while you are at it.
Fill the pot with hot but not boiling (remember you could crack glass with extreme temperature changes). Wait patiently as the denture tablets fizzle to break apart the sticky oils.
After ten minutes, remove the bong from the pot and rinse with hot water. While rinsing, use a toothbrush to clean the remaining dirty areas.