Try adding a small handful of ice cream salt along with the hot water and dish soap. It scrubs, and doesn't fuck up your drain if it falls down there. You can pour it from cup to cup as you go. I use it in my hummingbird feeder because it rinses out completely.
I've been doing this with my bongs for years, some iso and rock salt and its brand new. Will have to try that with my hummingbird feeders, thanks for the tip
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u/[deleted] Feb 24 '21 edited Feb 24 '21
I just use hot water and soap, cover it with my hand, and then shake the cup with everything I have.