In order to remove the dirt, the wax film must be partially dissolved. Dilute Lithofin WEXA up to 1:4 with water (test for the adequate degree of dilution in an inconspicuous area) and apply it to the surface. Allow the product to work for 10 to 15 minutes. Brush vigorously and rinse the surface with plenty of clear water. Allow the surface to dry completely. Applying Lithofin TC Classic Wax or Lithofin TC Ever-Sheen will achieve an elegant sheen on the surface.