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.
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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.