Dilute the pre-cleaner 1:20 to 1:60 with water, depending on the degree of soiling; apply to the surface using a DPZ or washing sponge and leave to work for a maximum of 5 minutes. If necessary, rework with the Interior Scrubber. Then wash off thoroughly with water and a sponge. Avoid sensitive surfaces such as galvanized steel and aluminium surfaces or real wood. After thorough cleaning, polish and seal the surface to protect it from rapid resoiling.