County Line Car Wash is a good, standard-priced do-it-yourself car wash open 24 hours. It features high pressure premium car wash stations with hot water and good pressure, though it can run out during very busy times. There is a wash brush, clips to hang floor mats, and an air blower. The beeper goes off at the one minute mark for adding more time. Payment is by credit card or cash converted to tokens. The area is kept pretty clean. It is noted that the location is in the heart of Centennial, and there can be police visits after dark. A reminder is given to press stop on the card reader and set the knob to off when finished to avoid extra charges.