I’ll try the spray pump, good idea. Soaking helps.
We will use GG4 mixed in bucket, seems to work better than GG3 or dawn. Apply to entire window and really just scrub.
Change water often, follow behind with clean bucket to final clean.
Each of 8 hospitals do this to thief windows, although some use non approved paints. These can take 30 minutes a window due to being applied to tempered glass.
Painful
