This weekend Tennessee DUI offenders will be washing cars for Mothers Against Drunk Driving (MADD.)

The car wash at an Auto Zone parts store on Saturday costs $10 and the money goes to benefit MADD. “They’re going to do all the work and we’re going to reap all the benefits,” MADD local coordinator Rosalie Smith said.

The Bristol Herald Courier reports the Sullivan County Sheriff’s Office will transport offenders to the store, where their volunteer labor counts double toward their jail hours.

Sheriff Wayne Anderson said drunken driving offenses run the social and economic spectrum. He said there are between 50 and 100 inmates on any given day who are DUI offenders. He said they are selecting inmates on a volunteer basis.

“It might even be their first time arrested,” Anderson said. “But it’s not their first time out drinking and driving. MADD is very powerful when it comes to legislation. I’d like to see us get more people involved.”

Anderson said a similar project has been done before, and the inmates “really enjoyed it. They felt like they were giving back.”