You may have seen videos of The Last Coat being used on dirty surfaces. Well, The Last Coat can be used as a waterless wash in this manner. However, we do want to make a couple of distinctions. Typically for light dust and dirt, and water spots, it is fine to use The Last Coat without washing. However, it's important to use your judgment on what kind of dirt and how much is present. Small rocks and pebbles, not a good idea. Dust is typically fine. After you purchase, we will send out a series of videos that will show you the different applications for using The Last Coat. In the first video, we show you how to clean a dirty surface. The technique in doing so is crucial but easy. We'll show you how. Also, it is good practice for your first application to use it on a clean and cool surface if possible. Clay barring will get you best results but is not required. If you do clay bar, ideally try to find a clay bar lubricant that has little to no wax in it. Anytime you clay bar you would follow up the same day with protection such as The Last Coat within in hours after completing. Either way, having a really clean surface allows The Last Coat to bond better to the surface, and make future cleanings much easier.