Interesting, because I did the 30 minute challenge last night, and it failed miserably.
I filled the kitchen sink with hot water, dissolved 2 teaspoons of PBW in it and submerged my bong for 30 minutes
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When possible, it's always better to fill the glass piece with the pbw solution, rather than filling a big sink with water. For a big sink filled with water, the solution is so diluted.
Plus, you probably were not able to use really hot water, correct?
With
@Ratchett plugs, you can fill any piece with solution.
I fill my pieces with hottest tap water to prime the glass/ get it halfway there/ not crack the glass when hotter water is added.
I then get water really hot in the microwave, stir in the pbw, and add to the piece. Let it sit for 10 minutes. Sometimes pour out a little bit and shake piece to hit the tough spots.
Caution----PBW mix is super slippery so I wear rubber gloves for that and as a heat insulator.
I use maybe 1/4 teaspoon max to clean any piece.
I'll try to actually measure the temp of the water I use but I'm guessing 160 F ??? Hotter water gets pbw working much much better
Was your piece only vaped? No combustion nasties in it?