How soon after application of a herbicide should the tank be cleaned out?

• A. Immediately
• B. Only when changing to a different herbicide
• C. Weekly
• D. Prior to the next use

Answer: (A)

Cleaning the tank right after finishing a herbicide application is essential to prevent carryover and cross-contamination. Residues can cling to the tank, hoses, and nozzles, and if you wait, they may dry or mix with future products in unpredictable ways, potentially injuring next crops or altering spray effectiveness. Cleaning immediately ensures the equipment is ready for the next job and helps meet label requirements and safety practices by reducing unintended exposure and environmental impact.

Waiting until you change products, cleaning on a weekly schedule, or cleaning only before the next use increases the risk of residue transfer and crop damage, and does not reliably prevent contamination.