We recommend a garden hose over a pressure washer, as the electrical components on the e-bikes can be easily damaged by water. Turn the power off, and start hosing the bike down from the top to the bottom with water only, or a mild detergent. Muc-Off is a popular cleaner, available on Amazon, sporting goods stores, or bike shops. So as not to scratch the frame, use a soft brush or cloth to rub caked on mud or dirt. Keep in mind that the frame is aluminum and does not rust, but there are other metal parts that may be subject to rust.