There are plenty of answers to the question at hand: 'How To Clean A Concrete Patio'? Before the cleaning procedure has taken place, the fact that has to be taken into account is that no concrete patios can be treated equally. Over a period of time, due to regular use of concrete flooring, grows a layer of grime and dirt, mildew or algae. The floors may have been ill-decorated with spills, oils, grease and other stains. Maintaining a concrete patio is essential for environmental hygiene thus it has to be cleaned periodically.