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Glass bong after multiple smoking marijuana, bong in marijuana resin. The concept of harm to human health and pollution after smoking drugs. on white isolated background Stock Photo | Adobe Stock
![My bong has some nice residue spots that won't wash off with hot water, kosher salt, and 91% isopropyl alcohol. Does anyone have any tips or tricks? : r/PaMedicalMarijuana My bong has some nice residue spots that won't wash off with hot water, kosher salt, and 91% isopropyl alcohol. Does anyone have any tips or tricks? : r/PaMedicalMarijuana](https://preview.redd.it/my-bong-has-some-nice-residue-spots-that-wont-wash-off-with-v0-2uvio98in8b91.jpg?width=640&crop=smart&auto=webp&s=521b130624030007b690806f759f6f57d0b9d9c4)
My bong has some nice residue spots that won't wash off with hot water, kosher salt, and 91% isopropyl alcohol. Does anyone have any tips or tricks? : r/PaMedicalMarijuana
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