My first approach was moisten the wall and scrape off with a spatula. It went down to the very first wallpaper even reasonably well. But the first wallpaper was installed about 60 years ago was extremely persistent.
Then I tried it again, only with wallpaper remover. It was the same result. It always took turns only a few layers.
The Wagner W 14 the first wallpaper soaked on the wall, but then so good on that I read once completely replace all wallpapers layers at the point where I had draufgehalten the Dampftapetenablöser.
For that I'd even forgive a 6 star if I could.
Although many wallpapers layers with occasional filler in between were still cumbersome, because only this small area replaced respectively. After half a day I had the whole room wallpaper free.