When you tackle the exterior of your vehicle : Start by rinsing the car completely Call , and then keep it wet falling on the Entire washing process to float dirt off the vehicle 's surface. Always choose a soap That has-been SPECIFICALLY Developed for cleaning vehicles. According to Gerry Bonanni , a senior engineer with Ford's paint and body repair team , " Even a mild dishwashing liquid can strip wax protection and possibly because waterspotting Concerns . " Use a sponge or wool mitt for cleaning, and always keep 'em wet and sudsy , this helps get dirt off the surface area of the vehicle INSTEAD of rubbing it in and possibly Causing scratches . Start at the top of the vehicle, move down to icts sides , and wash the bottom -where MOST of the dirt Usually accumulates -last . ...