What is the best practice for cleaning spray equipment between uses on different sites?

• A. Rinse with clean water and reuse rinse water as concentrate.
• B. Wipe exterior only.
• C. Rinse with clean water, flush until rinse water is clear, and dispose of rinse water according to label.
• D. Empty reservoir and let it dry.

Answer: (C)

Properly cleaning spray equipment between sites is about preventing cross-contamination and protecting crops, people, and the environment. The best practice is to rinse with clean water, flush the system until the rinse water runs clear, and dispose of that rinse water according to the pesticide label. Rinsing removes residues from the tank, hoses, and nozzles; flushing until the water runs clear ensures nothing stubborn remains inside. Disposing of the rinse water per the label is crucial because it follows the manufacturer's and regulatory guidance on how to handle contaminated water, avoiding environmental release or improper disposal. Merely wiping the exterior or drying without flushing leaves residues that can be transferred to the next site, and using rinse water as concentrate or simply emptying and drying does not ensure thorough removal of residues.