Nanowhiskers aren't used directly to repel stains on fabrics. While they have impressive properties, their application in stain repellency is indirect and often involves other materials.

Here's how the connection works:

* Nanowhiskers are often used in hydrophobic coatings**. These coatings are designed to repel water and other liquids, which is essential for stain resistance.

* The whiskers themselves might not be the active ingredient. They can act as reinforcing agents in the coating, making it more durable and resistant to wear and tear.

* Other hydrophobic materials are often combined with the nanowhiskers to create the coating. These materials could include polymers, silicones, or fluorocarbons.

So, while nanowhiskers are not the primary stain-repelling agents, they play a crucial role in creating durable and effective hydrophobic coatings that are then applied to fabrics.