What ever you spray it down with, wash it down with warm water as soon as possible. Top, bottom ,sides and ever part you can get to. A good two gal. garden sprayer will do the trick. Spray it down two times if necessary. Clean out the inside drain pan and all the drain piping. Might even replace the drain piping. Take the pump to a sink and use soap warm water and a brush. Then when dry I spray the buckhead with a rust preventer. This has worked for me every time.