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DIF good at softening the adhesive for removing wallpaper, not fantastic at actually getting it off the wall - it tending to soften it and smear it around, We found
-> paper tiger
-> DIF spray twice
-> warm sugar soapy water and scrape off excess glue, or a quick blast again with the steamer
-> sandGave best results, having done 3 floors worth of wall. I’d imagine it is dependent on adhesive used.
Thanks. Will investigate that, zinniser stuff is usually good.