MacG, we had this discussion on another thread and it looks much like it was about a similar event. Then I suggested you should talk to your neighbour about your concerns. You need to make sure you are not antagonistic, people don't like being shouted at. Try to look at the issue from their side before you start. Identify why they are applying this herbicide and exactly what your concerns should be.
Simzine doesn't move in the soil like atrazine does, so your side is unlikely to be affected except through spray drift. In most states in Australia it is illegal to allow spray drift, so if this is the problem focus on that instead of their use of herbicides. Suggest they use a lower pressure or coarser nozzle to minimize spray drift. You might also let them know that coarse droplets will make simazine work better than fine droplets.
They are quite correct about wipers and simazine-based products. These do not work all that well with wipers. You would use a wiper with glyphosate. Your observation of wiper use in a park would almost certainly be glyphosate, as parks tend to be very wary of using soil active herbicides on the somewhat erroneous view that soil active herbicides always kill trees.
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"How many legs does a dog have if you call the tail a leg? Four; calling a tail a leg doesn't make it a leg." Abraham Lincoln
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