First, wet the stain. Next, use your concrete degreaser to scrub the stain directly on the stain. Allow 10 minutes for the water to cool before washing and rinsing. Don't let the mixture dry after you've washed it. Any dirt you bring to the top will sink back into the concrete if you give it enough time to dry. Instead, use a powdered laundry detergent like Tide. Mix a tiny amount of powder with enough water to make a paste on the wet stain. The salt then works its way back to the top as it dries, leaving you with little choice but to start over. You can, if you're trying to clean the floor. If the floor is dirty, rinsing it with a power washer is highly beneficial. When it comes to salt stains, though, it doesn't work quite as effectively. The salt can be forced down into the concrete with a pressure washer. The floor appears to be clean, and you're content - for the time being. The salt then works its way back to the top as it dries, leaving you with little choice but to start over.