Sorry to hear your car is already fading. Fortunately, you should be able to stop it before it gets too bad.
First, you’ll want to thoroughly wash your car using a car washing soap and a sponge. This will take off all of the dirt and debris. Then, use an automotive clay bar to remove any leftover dirt. It’s a good idea to use an automotive clay lube, which will help the bar move smoothly across your car.
After that, use a damp buffing pad, electric buffer, and buffing compound to remove blemishes in the paint. Then, polish the paint with the compound and wipe the area with a microfiber towel to remove any leftover residue. Finally, use car wax or paint sealant to create a protective seal over the area.