When storing trailer-type sprayers, put blocks under the frame or axle and reduce tire pressure during storage.

It is very likely that you did the right thing when you used the sprayer the last time: you rinsed the whole system (tanks, hoses, filters, nozzles) thoroughly. If you did not, make sure there is no leftover spray mixture in the tank. Dispose of it according to the chemical label, and rinse the system with some sort of a rinsing solution. Usually a mixture of 1:100 of household ammonia to water should be adequate for cleaning the tank, but you may first need to clean the tank with a mixture containing detergent if tank was not cleaned weeks ago, right after the last spraying job was done.

Cleaning the outside of the sprayer components deserves equal attention. Remove compacted deposits with a bristle brush. Then flush the exterior parts of the equipment with water. A high-pressure washer can be used, if available. Wash the exterior of the equipment either in the field away from ditches and water sources nearby, or a specially constructed concrete rinse pad

Drain all cleaning water from all parts to prevent freezing.

To prevent corrosion, remove nozzle tips and strainers, dry them and store them in a dry place. Putting them in a can of light oil such as diesel fuel or kerosene is another option.

Pumps require special care. After draining the water, add a small amount of oil and rotate the pump four or five revolutions by hand to completely coat interior surfaces. Make sure that this oil is not going to damage rubber rollers in a roller pump or rubber parts in a diaphragm pump. Check the operator's manual. If oil is not recommended, pouring one tablespoon of radiator rust inhibitor in the inlet and outlet part of the pump also keeps the pump from corroding. Another alternative is to put automotive antifreeze with rust inhibitor in the pump and other sprayer parts. This also protects against corrosion and prevents freezing in case all the water is not drained.

Cover openings so that insects, dirt, and other foreign material cannot get into the system.

Finally, check the sprayer for scratched spots. Touch up these areas with paint to eliminate corrosion.