Mistah's DS8 has to follow the same rules I had for my kids when they were that age.
1. Everything is eaten at the table, napkin in your lap, pulled all the way up to the table
2. Nothing liquid in the bedroom ever, including glue, paint, glitter or other crafty crap like that
If you want to craft you do it supervised over newspaper at the table.
3. You have "your towels" so I will know exactly who left it on the floor (this irks me because it's one of the rules he tries to get away with breaking and he leaves them on the carpet. That doesn't fly with me.
Anything not cleaned up when you are told to clean your room (especially after it's "declared clean") i.e. shoved under the bed or the dresser etc. goes in a rubber bin in the basement for a week.