Reddit mentions of Zinsser 98014 4-Inch Long-Handle Scraper Tool

I used to do regrout and recaulk work every day. The best way is to use 4" razor blade/scraper to cut/scrape it out where you can by first cutting along the length of it and the scraping against the surface with the corner of the blade, changing the blades often helps a lot. Then go back with a grout getter to scrape whatever is left off the surface. If you keep the grout getter flat against one surface with firm pressure and the corner of the head pressed into the corner between the two surfaces you should be able to scrape pretty aggressively without scratching anything, though you do have to be extra careful on plastic, fiberglass, or any kind of resurfaced ceramic/porcelain (such as an epoxy resurfaced bathtub).

At the end of the day, there really is no magic fix. A heat gun or solvents can help, but sometimes, especially with really old caulk, it just takes a lot of patience and elbow grease.

Here is the quick and dirty: Clear the room out as good as you can. Lay down painters plastic. Pick up a product called Dif and a tool called a paper tiger, available at hardware stores near the paint, or at regular old paint stores. Follow the instructions to apply. I use a pump sprayer to apply the dif mix. Use this style scraper but make sure you dull the blade's edge beforehand, or you will nick the crap out of your wall. I like to put a horizontal slice across the wall about chest high, then start pulling from that slice. Try to take the biggest piece off the wall that you can. Make sure you get both the wallpaper and the glue layer. The glue layer looks beige and fuzzy when dry but turns paper-bag brown when wet. When all the paper is off, go over the walls with a damp rag to remove any remaining bits of glue. If you have any questions let me know.

Source: painter

edit: You will need to reapply the dif fairly regularly, so I suggest wetting one wall/area at a time. Also added some info above.

Nah I wouldn't do it, because you need a heavy duty spatula/trowel for the smashing and perhaps even an industrial scraper like this one they recommend for getting every last bit of beef off.

Just invest in a cast iron pan, best $25 you will ever spend in the kitchen guaranteed.

Get ready to remove wallpaper: https://www.amazon.com/Zinsser-98014-4-Inch-Long-Handle-Scraper/dp/B000RXF1GS