The answer to 'frequency of patio' is that the recommended frequency for maintaining and cleaning a patio varies depending on the material, usage, and local climate. Generally, most patios should be cleaned and maintained at least once or twice a year to keep them looking their best and prevent damage.
For concrete or stone patios, it's recommended to pressure wash or scrub the surface annually to remove dirt, grime, and any moss or mildew growth. Brick or paver patios may need to be cleaned more frequently, such as every 6 months, to prevent weed growth between the pavers. Wooden decks or patios should be cleaned and sealed every 1-2 years to protect the material from weathering.