

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:
- Make sure you have a strainer on your sink drain if your plumbing system is fragile.
- Fill every can or jar with water to near the top
- Wait 15 minutes
- pour out a can into the sink
- fill the can with a bit of water and shake the last bits out
- pour and lightly rinse the rest of the cans in the same way
- bin the gunk caught by the strainer.
I had very recently come across a reactionary content left-wing YouTube channel, reacting to Rachel Maddow of MSNBC reacting to Elon Musk’s interview… I thought that was pretty bizarre. (link).
It was a 30 second intro segment, then a 8 minute clip of the Maddow show, followed by a 1 minute outro commentary segment.