Proper tank rinsing techniques for agricultural sprayers are very important in order to protect against cross-contamination in subsequent loads and to ensure safe disposal of any excess chemicals and rinsate (rinse water). Spray tanks and other sprayer components should be cleaned after each use. In most situations, sprayer rinsate will have to be sprayed out in the field - either onto a reserved strip, or by over-spraying in the treated area (subject to the terms of the product label).
Watkins, G. A.; McNeill, Samuel G.; and Shearer, S. A., "Pesticide Application and Handling Technology: Installing a Sprayer Tank Rinse Circuit" (1994). Agricultural Engineering Extension Updates. 11.