While the untrained eye and perhaps the average consumer might confuse suede and nubuck, there is a difference between them. They both have a soft velvety appearance, though nubuck is actually the stronger and more durable of the two. For a nubuck jacket or pair of boots, you actually don't need to rely on commercial cleaners. Basic items that you most likely have around the house are suitable for nubuck products.
Brush your nubuck item with a horsehair or nylon brush, moving the brush against the grain to lift dirt particles. Shake out the item gently but vigorously to remove the dirt.
Move the brush against the nubuck now in the direction of the grain, stroking gently to get the grain back in place.
Rub a pencil eraser against light stains, wiping away eraser particles. If you have a tough stain, rub a 100-grit sanding block against it to remove. If you use sandpaper, sand only enough to remove the stain.
Run a handheld vacuum over the surface area of the nubuck to absorb lingering dirt particles and dust from sanding.