Apply orange oil to shop towels and rub over the surface of the Grosfillex product's resin parts. The orange oil should loosen dirt and grime so the shop towels can lift it away. Repeat as needed.
Wipe away any excess grime or orange oil with shop towels. Allow the orange oil to evaporate fully before continuing.
Spray the surface of the Grosfillex product's resin parts with an automotive detailing spray.
Wipe away the automotive detailing spray with a clean cloth. Refer to manufacturer instructions for how long to leave the spray on the surface of the Grosfillex product before wiping.
Mix 2 cups white vinegar with 2 tbsp. of liquid dish soap in a bucket of hot water.
Scrub any nonresin portions of the Grosfillex product, such as umbrella canopies, with a soft bristle brush using the vinegar, dish soap and water mixture.
Rinse the vinegar, dish soap and water mixture from the surface of the Grosfillex product with a garden hose.