With regards to using glass vessels on Pesach that were used year round, The Shulchan Aruch HaRav (Orach Chaim 451:63) says that, for Ashkenazim, if the glass vessel was used multiple times during the year for hot Chametz (or cold liquid that sat there for 24 hours), any hot liquid that was used on Pesach is forbidden to drink, unless the vessel was purged through boiling (Hagalah) or through Milui V'Irrui (filling the vessel with cold water and letting it sit for 24 hours. Repeat 3 times (see here)).
The Mishnah Berurah says the same thing in 451:26:155.
My question is, can one do Hagalah on glass without breaking it? Has anyone done it? Any tricks?