To all window cleaners (who are the smartest people on earth),
Having been in business a very long time I have struggled with the removing of adhesives like everyone else.
Yes, scraping is the ineviteable.
But you will not believe what takes off that nasty residue, and with no heat and no harsh chemicals!
An oil based product called Orange Glo removes the stuff that adheres to the glass because glass is poreous.
The residue actually becomes a part of the glass over a period of time; leaves a shadow that is almost impossible to take off 100 %.
There are also products made just for adhesive removal. "Desolve it" citrus solution is anther good one.
I was experimenting the last time I had to remove vinyl lettering. What a pain in the rear end. We always have to resort to scraping, but these oil based products can be found at Walmart and grocery stores.
You have to use a separate set of equipment because oil will destroy window cleaning tools until they are cleaned.
I have also bought "adhesive remover". It is oil based.
The orange glo is a furniture oil. Apply the oil, use a scrubber with rough texture; then scraper. You will save a lot of elbow grease without using harsh chemicals.
Hugs,
Texas Girl