There are a few things you can do to clean the bottom of your shoes before you wear them again. First, take a damp cloth and rub it all over the bottom of your shoes. This will help remove any dirt, dust, or other debris that may have built up on the surface over time. Second, use a vacuum cleaner to suck up any excess dirt and dust that may have built up on the surface. Finally, use a hairdryer to dry off the bottom of your shoes.