Harry Bloomfield wrote:

In my sprayer I have some diluted Rosate 360 TF according to
instructions, left over from last year. Will it still work this year
please, or do I need to make up a fresh batch?

I had a sprayer half-full of diluted glyphosate that had been sitting
over winter, I also wondered if the active ingredients might have
degenerated, sprayed the weeds on Monday and they're looking very dead
already.