If you are doing a DIY car wash and wax you want it to look as shiny as when the professional do it, right? Sometimes, the wax dries before you can buff it all off leaving the surfaces cloudy and dull. To lift off this residual wax, sprinkle a little cornstarch onto a clean, soft cloth. Now, wipe the dull areas. The fine powder will soak up all the extra wax without harming the paint leaving you with a shiny ride.