- 1). Scrub the black marks with hot soapy water and a sponge. Use car wash or detergent as your soap, as these are more suited for cleaning campers than regular soap. Follow up by scrubbing with a stiff bristled brush to loosen any dirt and grease.
- 2). Apply a coat of WD-40, and scrub it into the black marks with the brush. Wash with soap and water once finished.
- 3). Mix hot water and RV Wash, as per the directions on the package. Spray it directly onto the black marks, and allow it to sit for ten minutes.
- 4). Scrub off the RV Wash with a sponge and stiff bristled brush.
- 5). Wash off any remaining residue with clean water from a garden hose. Wipe the area clean and dry with a microfiber cloth.
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