Superman: He's more open to the public but I still say Lois does his washing. Washer.
Batman: Alfred does it. Even if Alfred didn't, Bruce would use the washer. Washer.
Green Lantern: Definately dry clean. Kyle probably wants to go out and talk to others around the neighborhood anyway. Jade COULD, but I would say that Kyle would just save her the trouble.
The Flash: Dry clean. See GL.
Martian Manhunter: Washer. See Batman.
Wonder Woman: This is a toughee. I'd say dry clean based on seeing her out grocery shopping and such in JLA once. Its a toss up.
Aquaman: Washer. See Batman.
Spider-Man: Dry clean. See GL.
Wow, this was more fun that I thought. Great question.
"Leaping Lanny and Randy Savage are brothers, and Randy Savage, your name is Randy Poffo. THAT'S RIGHT, RANDY POFFO. You're ashamed of going around calling yourself Poffo so you probably got the name Savage because you're ashamed of putting yourself on the same level as your brother because he is much better than you are. YOUR BROTHER IS A HUMAN BEING. YOU'RE NOTHING BUT A SCUMBAG. THAT'S WHAT YOU ARE; YOU'RE A DOG. YOUR NAME IS POFFO." - Ronnie Garvin to Randy Savage, ICW Wrestling, 1980.