Do NOT click on any vaporpedia.com links. The domain has been compromised and will attempt to infect your system. See https://fuckcombustion.com/threads/warning-vaporpedia-com-has-been-compromised.54960/.
I use flexible safety razor blades, they get in the corners real nice. I've also seen what looks like a dabber with silicone tips meant for scraping oil off of glass.