The Car Wash couch gag is the fourth couch gag of Season 18.
The Simpson family runs into the living room and sits down on the couch as usual, but both the family and the couch move across the floor like a car wash, where they get sprayed with water, squirted with hot wax, and scrubbed with brushes. Marge's hair turns puffy, Maggie's pacifier turns up missing, and everyone looks exhausted as three men wipe them dry and one of them puts a new pacifier in Maggie's mouth.
- Homer Simpson
- Marge Simpson
- Bart Simpson
- Lisa Simpson
- Maggie Simpson
- Car Wash employee 1 (couch gag)
- Car Wash employee 2 (couch gag)
- Car Wash employee 3 (couch gag)
- Episode – "G.I. (Annoyed Grunt)"
- Episode – "Crook and Ladder"
- Episode – "At Long Last Leave" (Snapshot montage with other episode's gags)