What is the term for the water left over after washing pesticide application equipment?

The correct term for the water left over after washing pesticide application equipment is "rinseate." This term specifically denotes the residual liquid that remains after the equipment has been rinsed and is often contaminated with pesticide residues. Rinseate must be managed carefully to avoid any potential harm to the environment or non-target organisms, as it can contain harmful chemicals that were used in the pesticide application.

In contrast, the other terms listed do not accurately describe this specific context. "Mixate" refers to the mixture of pesticide with water or other carriers before application, while "residual water" is a more general term that doesn’t specifically pertain to the rinsing process. "Disposal water" could potentially imply water designated for disposal but does not capture the essence of water that remains from the rinsing process of equipment used for pesticide application.