An unclean car becomes a surly car, often acting out by speeding backward down the highway and trapping its owner inside itself while blasting smooth jazz. Turn down the soprano sax with today's Groupon: for $9, you get The Works car wash at Neponset Circle Car Wash (up to a $20 value), located in Dorchester.

Neponset Circle Car Wash keeps vehicular motors running with a cascade of self-service and automatic washes. With The Works wash, your auto's hide will be doused in a meticulous exterior wash while Simoniz triple-foam polish, Simoniz double-bond coating, and sealer wax protect it from the sky's pesky rain and sun-searing rays. Wipe away any beach sand, desert dirt, or Neptunian dust from your car's wheels with Wheel Brite and Tire Shine, and induce giggling from the grills with a thorough undercarriage wash.

Though Neponset Circle Car Wash features a mail-in rebate online, this Groupon still offers the best deal available.

Reviews

Three Yelpers give Neponset Circle Car Wash an average rating of four stars. Five Insider Pagers give it an average rating of three stars:

• I find this an easy place to stop into for a great wash. I always encounter friendly people and good service. – F W., Insider Pages