the esso/mobil besides the SPC kiosk along upp thomson road (after / before Pierce Sec Scool..depending on the direction you coming from) has one..its 6 bucks per wash...24/7..
another one i know off is along the stretch of amk ave 3 till serangoon north side..this one is in the Caltex petrol kiosk. 5 bucks per wash..also 24/7
lastly is go to your multi story carpark and wash the car yourself loh...lolz!!!..

80 cents in total (20 cents per bucket) but you would need at least 1 1/2 hours to wash your car..depending on car sizes...
