what type of chemicals to use for driveway wash?

1. Detergent or Degreaser: These are effective for removing general dirt, grime, and oil stains from driveways. Look for products specifically formulated for pressure washing driveways. 

2. Bleach: Bleach can be used to remove mold, mildew, and algae stains from driveways. Mix bleach with water according to the manufacturer's instructions before applying. 

3. Concrete Cleaner: Concrete cleaners are designed to penetrate and lift tough stains from concrete surfaces, making them suitable for cleaning concrete driveways. 

4. Oil Stain Remover: If your driveway has oil stains, you can use a specialized oil stain remover to break down and lift the oil from the surface.