When painting glass panes, don't bother taping first, just paint, let it dry, spray with a vinegar/water solution, score along the edge of the pane and scrape off with a razor blade scraper and the paint comes off easily
Removing years of bad paint decisions from hinges and door knobs. Easy as water, heat, and baking soda. I actually did this in my old bungalow. Really very easy, butr emember, metal gets hot people.... I may or may not have burned myself.