If you are continuing with the same pesticide the next day, flushing with water is sufficient. However, if you are switching products or crops, a more thorough cleaning is required. Be sure to clean the entire sprayer system, not just the tank. Operate the pump and flush the cleaning solution through all hoses, strainers, screens, nozzles, and the boom. Small amounts of residue left in these areas can be sufficient to cause serious damage to a sensitive crop.
Most injury occurs when switching between crops.
The following procedure is recommended when there are no specific cleaning requirements given on the label. Drain the sprayer tank and lines and rinse tank, boom, and lines with water for a minimum of 5 minutes. Flush the solutions through the entire sprayer system. For growth regulator herbicides, let the solution stand overnight. Add more water to fill tank and agitate solution for at least 15 minutes and flush through the nozzles.