The most important process in exterior wall painting is surface preparation. One of these is "high-pressure washing." Water is sprayed under high pressure to wash away peeling paint, algae, moss, and other dirt. The advantage of high-pressure washing is that it allows the paint to adhere better to the exterior wall material when painting, so the beauty of your home will last longer. However, since the cleaning is difficult to see with the naked eye, problems can occur if you wash carelessly or paint without drying the surface properly after washing. If the cleaning is insufficient, the paint may peel off in a few years, so care must be taken.

70% of dirt on exterior surfaces is caused by bacteria such as mold and moss. It is effective to thoroughly wash away this dirt using a bio high-pressure washer. It can be used on all materials such as wood, stone, and tiles, and can thoroughly remove mold, algae, and old paint that hide in gaps less than 0.01 mm in size and cannot be removed with a regular high-pressure washer. By thoroughly removing dirt, the adhesion of the paint improves, and the paint's performance lasts much longer. Another benefit is that the beauty of the paint is maintained due to its bactericidal and disinfecting properties.