The surface is not damaged, but there was a film of care products on the surface, which has now been partially dissolved. Thoroughly clean the surface with Lithofin KF Intensive Cleaner. Lithofin EASY-CARE does not build layers or films and should therefore be used for regular maintenance.
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.