Can I throw in the trash old Menorahs and oil cups?
Yes. However, it’s best to wrap first in something and then discard. ראה גנזי הקודש טז הערה יט. יט, יג. https://asktherav.com/how-should-one-dispose-of-the-menorah-wicks-and-also-the-shabbos-candles/ #6466