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How spooky Gary.
I was thinking about this subject only yesterday afternoon.
One tip I was given by a farm manager many years ago is to quarter-fill the tank with lukewarm water and then add washing-up liquid and vinegar.
The two chemicals neutralise the residues.
I tend to triple rinse the sprayer in between different applications.
I keep 2 different sprayers, one for all the grass work and the other for the mmc pro.
Will probably buy a 3rd sprayer next year and only use it for glyphosate...
On a side note, do you leave any water in your sprayers between use to protect the seals?
I use 1 sprayer for Glph, and 3 for lawns, 1 for 2-4d, 1 for spare and 1 for Longbow.
All are washed out with washingup liquid + water, then flushed through with water again.
triple rinse and flush through lance for me. my old boss taught me that - with the example of how he forgot to flush the pipework of a boom sprayer and the next guy to use the equipment sodium chlorated 20' of blackcurrant bushes.
never had a problem doing it this way, and can quite happily swap between insecticides, fungicides and herbicides.
It might pay to consider what happened here: http://www.landscapejuicenetwork.com/xn/detail/2074886:Topic:624438
There's a suggestion that weedkiller found its way into the canal via a sewerage plant. Someone tipping surplus material down a drain, perhaps?