Are pesticide residues on and in spray equipment easier or harder to remove if they are allowed to dry first?

When pesticide residues are allowed to dry on and in spray equipment, they become harder to remove. This is primarily because as the pesticide dries, it forms a more adherent layer that bonds with the surfaces of the equipment. Dried residues can create a film that is more challenging to dissolve and wipe away compared to wet residues, which can often be rinsed with water or solvents more easily.

Additionally, dried pesticide residues may undergo chemical changes that further enhance their adherence to surfaces, making cleaning even more difficult. It’s generally best practice to clean spray equipment immediately after use while residues are still wet, which facilitates easier and more effective removal of any contaminants, thereby ensuring the equipment remains in good working condition and minimizes the risk of cross-contamination with future applications.