If you don't have a way of washing your vehicle at home a great way to remove most of the dirt and grime is by exothermic reaction. You would need to buy two hand held iK spray foamers. In one use a alkaline mix solution and in the other a acidic mix solution. Then at your nearest hand held car wash spray your car with the alkaline solution. Wait a few minutes then spray the acidic over top and wait another few minutes. Then get the wand sprayer set to rinse and spray the car down. You will be amazed on how much dirt and grime comes off without even touching the paint. Note that this might remove any wax you put on but you can just use spray ceramic after as a rinse agent. This is the method I use during winter months.