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How to clean a concrete patio
Remove all furniture and other objects.
Before getting started, you'll want to make sure your patio is completely clear. Find a place away from your work area to stash patio furniture, dining sets, planters, grills, toys and anything else that may be damaged by free-flowing water or cleaning solutions.
Your work area should ideally be as empty as you can get it. Bring lightweight furniture inside, and move heavier pieces to the yard, sidewalk or a covered porch.