Cleanliness is important but sometimes it’s important to cut housemates some slack. Allow them to finish eating first before forcing them to clean the kitchen. If they say they’ll wash up in the morning because it’s late then it’s ok if it doesn’t interfere with anybody else.
“I left a tiny bit of mess in the kitchen which I was going to clean up after eating,” Charwizz described. “He turned off the power in the flat and refused to turn it back on until I cleaned it up. It was dark by this time, so I had to do it all in the dark. I felt this was an immature reaction to something he could have asked me to do.”