We had some 15 year old glue that we contended with... we did the steamer (what a time consuming process!), we did the picking at it with razors... but in the end what worked best was using the paper tiger to put tons of holes in the wall and using a garden sprayer to spray vinegar all over the wall. The vinegar did an awesome job! I was seriously considering getting the chemicals and going that route, but tried this first. There is still lots of work, but it is 100 times faster than the steamer (maybe a bit of an exaggeration). You will still have to fill in uneven spots with drywall compound, and sand them down. Be sure to prime two coats, then paint two coats.
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