1. Purpose: Determine the primary use of the high pressure washer. Are you planning to clean your patio or your car? The type of surfaces you need to clean and the frequency you need to use it, will determine the size and power of the washer you need. 
2. Power: Consider the pressure and flow rate of the washer. The pressure is measured in bars and the flow rate is measured in liters per minute. A higher bar pressure and l/minute mean the washer will clean more quickly and effectively. 
3. Size and portability: Think about where you will store the high pressure washer and how you will transport it. Consider the size and weight of the machine, and whether you need a model with a folding handle or wheels for easy maneuverability.  
4. Accessories: Check what accessories come with the jet washer, such as different nozzles, brushes, and detergent tanks. Some machines comes with additional accessories perfect for cleaning your roof, your patio or your car.  
5. Price: High pressure washers can range in price significantly. Consider the features you need and what you're willing to spend. Keep in mind that a higher price may indicate a more durable and powerful washer, but it may not always be necessary for your needs. 

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By considering these five factors, you can find a high pressure washer that will meet your cleaning needs and fit your budget. It's also important to read reviews and compare different models before making a final decision. With a high pressure washer, you can enjoy a powerful and efficient cleaning tool that will make outdoor cleaning tasks easier and more enjoyable.