If you’re just trying to keep dirt from being tracked into the tub, you can use a garden hose to spray off any dirt. Make sure the pressure is high enough to dislodge any dirt stuck in textured plastic. But if your steps have seen a lot of traffic, it might be time for a deeper cleaning.; Dirt packed into the textured surface can compromise its nonskid ability, and mold makes everything slippery. Plastic steps can be scrubbed with warm, soapy water to remove dirt and mold. Make sure to rinse afterward with a hose to remove any slippery soap residue. If you have wooden steps, check the manufacturer’s instructions to be sure you don’t damage the finish.