Tire gloss doesn't seem to last very long. Whenever I do a thorough cleaning and do the tires, a few days later you would never know I did anything to the tires. Is there a product that lasts longer?
Honestly, I don't see how a product *could* last longer. The dirt and dust are going to get on the tires, and until they come up with a true dirt-repellent, you're going to have to keep washing them off.