

I make mistakes because my replies are often my stream-of-consciousness, and the primary review is mainly to make sure I even want to reply to the comment at all. I don’t use autocorrect so my fingers slip frequently.
If you look through my comment history, a good chunk are edited because I catch more grammatical errors in my comment after I post. I suppose most others don’t bother.
This is assuming you are expected by your council to clean it “thoroughly enough”.
After you eat/drink the contents, a very quick rinse is all that’s needed. Little stains aren’t going to be bad for recycling.
If you’ve left it for a while and are worried, a simple but surefire way to clean out any significant gunk would be these steps: