Hiring Someone to Do Laundry?

Not sure what the going rate would be but what I would do is stop at a local laundry mat that offers to wash clothes and find out what they charge. Use that amount as a "high" price.

I do have suggestions on where to find someone to do the laundry though:
Stop by a local school/college and see if there is a job board. You can also try a local church.

Another option is to ask family and friends if they now anyone or have a teen that would be interested.

In a town I used to live in up in Maryland there used to be a radio show where you could call in and sell stuff or ask to buy things.

You could also ask for workers to call you. Check your local radio stations to see if they have something similar (even TV stations).

You could also try Craigslist for your area.