sharp blade is the best way I've found.
sharp scraper , and oil flow,( from titan labs)keep glass wet , and only scrape in one direction , lift of blade between passes.daz
Some sealants are water soluble I hope so as it can be painstaking to remove. Aftervscraping residue can be removed with ordinary cornflour starch and I have also heard of using baby talc and wire wool. Schhh its a secret. !