I got bed adhesion problems that cleaning bed or drying filament didn’t resolve. Not with PLA that sticks ridiculous well. But with PETG.
I figured out a little simple glue stick procedure that was superior to just smear around a thick layer of glue.
I put glue on a 50mm circle in the center. Then I take the corner of a wet piece of cloth and work out the glue to an thin invisible film that is quite tacky.
The thin film is easy to clean up compared to a thick layer of glue and the prints stick very well to the bed. Not a single issue after that with that brand of PETG which was impossible before.