old and tired
Veteran Member
Problem would happen if you were to use the tank AFTER spraying 2,4D (you clean like you normally would) then use the sprayer on a sensitive crop like like cotton. You *might* get it clean enough but it takes just molecules of 2,4D to screw up some plants.....I never had any problems.
If you are using the tank to kill one thing vs. killing another thing - you don't even need to clean it. I guess the OP needs to state what else his plans are for the tank...
Grass can handle 2,4D google says the normal rate for 2,4D on perennial grasses; "Use 2 to 4.2 pints of product per acre per application". That's why you never had a problem.
I'm guessing most of us just use the tanks for killing only... the research station I worked at had separate sprayers for 2,4D since they killed thousands of dollars of research plots one year.