I recommend at least once a year. This helps maintain their appearance and prevent the buildup of mold, mildew, and grime.
Doing it yourself can be quite effective if you have the right equipment and follow safety guidelines. However, it can be physically demanding and time-consuming. If you find it challenging, consider hiring a professional to ensure the job is done thoroughly and safely.
We also do commercial cleaning in Melbourne, Australia. Feel free to reach us out if you need any help.
Happy cleaning!