The answer to 'tough stains on pressure washing' is that there are several common causes for tough stains that are difficult to remove with a pressure washer. These can include built-up grease, oil, mildew, or other stubborn dirt and grime that has bonded to the surface over time. Symptoms may include discoloration, streaking, or a surface that still appears dirty even after pressure washing.
To address tough stains, you can try using a pre-treatment solution or degreaser before pressure washing, scrubbing the area with a stiff brush, or using a higher pressure setting. However, for extremely stubborn stains or damage to the surface, it's best to call in a professional pressure washing service that has the right tools and expertise to safely and effectively remove the stains.