Question:
After I ate meat, can I use a dairy plastic cup to drink from? The cup has had dairy in it, not just that its used during dairy meals, and it is cleaned with hot water.
Answer:
If the cup was washed out and it is clean of milky residue it is permitted to drink from it, after eating meat. Technically it would be permitted even during a meat meal, however for practical reasons it is not adviseable, because things can get mixed up.
Best Wishes
Sources:
Badei Hashulchan 8-27.
