Description ProTank is an adjuvant that removes pesticide and fertilizer residues, reduces metal corrosion and the deterioration of rubber seals, diaphragms and hoses. Plus, spray system residues can damage subsequent crops, even at low rates. Proper cleaning of sprayer equipment and use of ProTank can prolong the life of equipment, reduce downtime in the busy season and avoid crop injury from contaminated tanks when switching to susceptible crops.