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How do I clean or flush the detergent tank/siphon tube? Article Very simply, you will want to run clean warm water through the detergent tank and siphon tube. This helps prevent any soap residue from collecting inside the detergent tube and pump, and will help prevent future problems with the detergent system. We recommend that you flush out the detergent tank/siphon tube at the end of each job, before stowing the pressure washer. If your pressure washer has a detergent tank, simply 1) fill the detergent tank with water, 2) attach the Vario Spray Wand with the "MIX" setting selected (on electric pressure washers) or attach the black detergent nozzle (on gas pressure washers) and 3) press the trigger gun and spray until detergent no longer comes out of the nozzle. If your pressure washer has a siphon tube (but no tank), simply 1) fill a clean bucket with fresh water and insert the siphon tube into the bucket, 2) attach the Vario Spray Wand with the "MIX" setting selected (on electric pressure washers) or attach the black detergent nozzle (on gas pressure washers) and 3) press the trigger gun and spray until detergent no longer comes out of the nozzle. Make sure to use an environmentally-friendly, biodegradable pressure washer detergent, such as Kärcher's SoapPacs, to avoid damaging your pressure washer. Running solvents or bleach through the detergent tank can permanently damage the pressure washer and will void its warranty.   How can we improve this information? Not the information you were looking for? Let us know how we can better answer this question. We routinely review user comments to help us better provide the information you are seeking. Please note that this is for feedback only, you will not receive a direct response to your comment. If you need a personal response, please click on "Submit a Tech Support Ticket" below. Thanks! Image verification required Please enter the characters that appear to the right in the space provided. This is just to verify that you are a human. Full Name: E-mail Address: (optional) Your feedback on how to improve the answer to the above question: