No glue, tape, spray, juice....just a good clean heated sheet of glass. I keep the heat on the whole print or the glass will contract and pop the printed part off. Every other print, I give the glass a good wipe down with isopropyl after scrape with a boxcutter blade.

Mendel90, 0.3mm j-head Mk5 1.75mm, and PLA from Diamond Age here in NZ.