I always get a good clean from the Hoppers Crossing Magic Hand Car Wash. The crew is courteous, has eye for detail and usually there's not spot unattended. In case there is a minor thing or two to point out, they politely accept it and do the needful.
Not every franchise is the same. Watch out for the Magic Hand Card Wash in Pacific Werribee. Their service is far less satisfactory and usually leaves a number of unclean areas.