Flat bed trucks must be clean of any debris i.e. (sand, dirt, hay and paper etc.) items less than 10 lbs.
Remove any items that extend pass the vehicle. (Ladders, wood or rear mounted bike racks).
Drive into the bay as slowly as possible (inches at a time) for the undercarriage wash.
When approaching the pressure plate on the floor, let go of the steering wheel. This will allow the treadle/pressure plate to guide your vehicle into position safely. Remember to drive very slowly!
Drive under the air dryer very slowly. Once you can feel the air hit the hood, pause for a few seconds and allow the water to be forced off. Now proceed under and through the drying area. NEVER BACK UP!
After the wash, take a few moments to hand dry and touch up. This gives you the opportunity to evaluate your cars finish and give a little extra attention to the glass and wheels.
Every once in a while you may find that your car did not wash well. This may have occurred for a couple of reason.
It rained in the past day or so and your car is loaded with road film/oils or road antifreeze applied on winter roads. This causes streaking up the hood and roofline. You should be able to remove this film with a damp cloth.
The vehicle has not been waxed in several months. Remember, just because your car is new does not mean it has been waxed. A professional wax treatment will deep clean and protect the finish, thus creating an easier car to clean.