A gas pressure washer is a powerful cleaning tool that uses a gasoline engine to generate high-pressure water jets. It is designed to remove dirt, grime, mold, and other tough stains from various surfaces, such as driveways, decks, and vehicles. The pressure is measured in pounds per square inch (PSI), and higher PSI ratings indicate more cleaning power. These machines typically come with different nozzle attachments to adjust the spray pattern and pressure for different cleaning tasks. Gas pressure washers are favored for their portability and ability to operate without being plugged into an electrical outlet, making them ideal for outdoor use.