Why spray alcohol on the wall?

Some projects require a totally clean oil free surface, even oils in your hands can cause problems, alcohol will remove it

Maybe this is what you are looking for? It's a paint technique where you spray alcohol on the wall as you are painting.

https://www.hometalk.com/diy/paint/walls/paint-putty-knife-and-a-powder-room-15308808

I use alcohol on the wall before I attach a Command Hook.

There's a really neat paint technique called alcohol ink, that would be amazing to do on a wall!

https://www.hometalk.com/diy/decorate/rooms/alcohol-inks-and-marble-hexagon-coasters-41148733