Take the glass off. Remember which side is up. Clean it well with liquid soap or detergent and water and some kind of scraper like a putty knife. Dry it and examine it. If it's perfect, then do a final cleaning with glass cleaner (meant for cleaning windows). Do not touch the surface with your greasy fingers (by now they should have interacted a lot with soap and the oils should be gone anyway).
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Now ideally you want elmers wood glue. Or any wood glue. Mix that 1 part with 10 to 20 parts water (it's not an exact thing). I like to use a jar with a lid so I can put the lid on and shake it up well. Use a paint brush to paint this onto the glass. Wait until it dries (that's one reason to preheat to 60C). Should take about 2 minutes.
I also tested both the hairspray and wood glue and both worked ok. Not perfect but ok. The bottom layer still is terrible. However, what I found out is that the filament (Renkforce PLA) is absolutely useless. After testing with Ultimaker PLA, I concluded there's probably no better filament for UM3 than Ultimaker PLA!
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