I have a wall with (a very rubbery) latex paint topcoat over a painted surface on drywall that it is only marginally adhering to. Trying to sand or even rub on it removes it slowly and not very efficiently. I'm afraid to paint over it, so I want to remove it. Is there any mild chemical or other process that will loosen it enough to remove it, so we can patch, re-prime, and repaint over it?
If it's not well adhered to the wall, the first thing I'd try would be heat - get a heat gun (sorry, your wife's hairdryer won't work) and a scraper and try that approach before resorting to any chemicals.
Latex Paint reacts to Ammonia. If the surface below the latex paint is sound; simply apply a light solution of ammonia and the paint will bubble up. Then scrape off the paint. You may have to re-apply a few times to get all the paint off.
Used my Han steam cleaner with the hose nozzle, paint became soft and rubbery, peeled off in sections.