I just spent thirty minutes of my life cleaning ds's multiple booger walls. It's bad enough that he does this to his own bedroom wall and the bathrooms, but the hallways??
But thanks to the BBB, I have the technique down now! I used a spray bottle with warm water, let them soak a bit and wiped them off. It was easy in the bathrooms due to the glossy paint, but the regular paint didn't fare as well. Probably should have used some type of cleaner on those but I didn't have the energy to figure it out.
I will admit I'd let it go for a long time, but if he starts it again