Two more sheilas that I just remembered: 1. If I want to use an oven that was previously used for fleishiks but hasn’t been used in at least 2 months, and I want to use it for milchiks, is it enough if I heated it up for an hour but didn’t clean it out?
2. I pointed out to my friend that something she was doing was a sheilah – something to do with using an oven on Shabbos, but i dont’ remember the situation – and she asked her husband who agreed it was a sheilah.