Hello I’m renovating an old farmhouse and a numpty has skimmed walls with gypsum plaster. I’m painstakingly cleaning it off by trying light steaming and gentle scraping, but wonder if there is a method whereby I can soak it to break the bond and scrape it off. Bit more easily? The walls will be wonky and uneven but will at least breathe. I’m patching with a lime filler. Thanks for any advice Bess.