Some of you might already know this trick, but if you are printing on something removable, like a mirror clipped onto your heatbed, and the parts are stuck on really well from using glue, etc., you can get the parts off with no trouble, by putting the mirror, with the stuck parts, in the freezer for 5 or 10 minutes. They just pop right off!
It’s nice to not be scraping on the bed with a lot of pressure, because the carriage is such a precision, calibrated mechanism.