I purchased this model based on the reviews, cost, and weight. It was useless cleaning my deck. There's not enough power to clean anything. I have a call into the company to see how they will resolve this problem.
Joan Does Not Recommend This Product
I apologize for the issues you are having. However, you purchased a unit that is 1500 PSI. To give you an idea of PSI, your local car wash will have approximately 1800-2000 PSI. This unit would be slightly below your local car wash. To get better results, I would recommend using a detergent to help you clean your deck. I would recommend the Simple wood deck cleaner model 18200. I have attached a link for you to view that item.