It is important to keep your car clean at all times for a number of reasons:
- Legal: it is illegal to have obscured number plates
- Safety: it is unsafe if your lights are not visible to other or your beams cannot be seen easily
- Manufacturers: many car manufacturers state in their user manuals that they recommend regular cleaning to maintain the paintwork
- Convenience - dirty cars can damage your cloths or dirty your hands
- Image - A clean car gives a good initial impression and shows off your car to it's best advantage
It is also important that having washed your car, you wax the paintwork and you was it frequently. The longer substances are left on the paintwork (road dirt, tree sap, bird droppings, asphalt etc) the more damage they do to your car: and high temperatures make the corrosive effect worse, leading to fading and permanent blemishes on your vehicles paintwork.