I was getting my little guys to clean it and it was almost done when the solution disappeared and the wall's marks reappeared. What happened to the clean wall?

If you don't finish quickly enough, the compound will harden and be unusable. If that happens, you'll need to start the repair all over.

afamilysomeday, it's best to wait until you have at least one teen as well as mom and dad to work on the wall together. They'll try to wander away from the job, but just keep picking them up and dropping them on the bucket until they finish it.