Abstract: Vehicle undercarriage cleaners clean the undercarriage of vehicles. Dirt, mud, salt, chemicals, snow and other materials accumulate on the undersides of vehicles. The vehicle undercarriage cleaner removes these materials without requiring the user to manipulated during use by employing a set of interlocking pipes and joints laid out to form a nested rectangle. Water holes piercing the top surface of the pipes result in sprays of water when a hose is connected to the hose attachment mechanism. Addition or removal of pipes and joints allows the dimensions of the vehicle undercarriage cleaner to be adjusted to accommodate any vehicle.