Remember kids, part of being an adult is cleaning your bong regularly

And this is all you need. The salt won't dissolve in the isopropyl alcohol (IPA) but it will dissolve all of the caked-on crust off your bong. The salt acts as a scrubber to loosen it all up. just add both and shake. for smaller pieces you can soak them in this mixture. That 420 cleaning product you can buy is literally just this but it's also dyed blue and costs roughly 700% more than just these two things will. Cheers y'all!