We are painting indoors and my son used the downstairs wash sinks to rinse our brushes and roller. He had hot running water and a bucket to let them soak in but when I went to do wash last night the sink was still almost 3/4 full of water (from about 3 hours earlier).
I am thinking more paint got in then he thought. He did rinse the roller brush directly in there and that was a bit of paint on it. I used a plunger and ran hot water again. I even used some baking soda and vinegar. About 4 hours later it was down to just an inch above the drain.
This is a rental so I would like to get this working again.
I wondered if there was anything else to dissolve the paint. I was not certain about plumber's helper or such.