Concrete Resurfacing in 4 Steps: Instructions Video ...
For surface preparation, wear heavy boots and protective glasses and blast off surface dirt with a gaspowered pressure washer that can reach at least 3,500 psi. Fit the wand with a 25degree fan tip, and hold it 6 to 8 inches from the surface as you clean the concrete with slow, even sweeps. To remove mildew or algae, use a concrete wash.