Concrete is a fairly porous material. This means that if your dog or cat uses your patio to do its business, it can eventually lead to a pretty rank odor that not even a hose can get rid of. Fortunately there is a pretty simple method to ensuring your patio is urine-smell free.
Mix one gallon of white vinegar with one gallon of water.
Use the sprayer to coat the patio with a layer of the vinegar-water mixture. Allow the solution to soak into the concrete until the patio is dry.
Crush the charcoal into a powder. You can do this by stomping on the bag.
Create a powder that is one part charcoal and one part baking soda.
Coat the patio in the powdery mixture. Allow it to sit for a few hours.
Sweep up the powder, which should have deodorized your patio from any remaining scents the vinegar mixture didn't counter.