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Use a power washer to remove dirt and loose concrete. Let the concrete dry completely. Sweep off the concrete with a stiff-bristled push broom. Cover control and expansion joints with weather stripping.
Plug the power washer in, connect it to a water source, and turn on the machine using the switch. Hold the end of the power washer 3–4 inches (7.6–10.2 cm) from the surface of the concrete and pull the trigger to shoot out water. Use back and forth strokes to clean all of the concrete completely. Focus on areas where concrete is loose or deteriorating.  Look for a power washer with a fan tip that reaches 3500 PSI to clean your concrete slabs. If you don’t have access to a power washer, you can get an attachment for your garden hose. Cleaning your concrete makes the resurfacer adhere better. Give the concrete 1-2 hours to dry after power washing it. When the surface of the concrete is dry to the touch, you can move on. Once the concrete is dry again, sweep the rest of the dust and residue off with a push broom. Work in small areas at a time to clean off the area entirely before moving on. Resurface your concrete on the same day you clean it, or else dirt and dust will start to form again. Remove the backing from peel-and-stick foam weather stripping. Push the weather stripping into the cracks between your concrete slabs so the resurfacer doesn’t fill them in.  Weather stripping can be purchased at your local hardware store. The expansion joints between slabs cannot be filled since they allow the slabs to shift naturally without cracking.