"Mark" wrote in
:

All the chemists aside, I doubt the vinegar, used occasionally in this
manner, would be any more damaging than the normal pollutants in the
air or rain. If it's worked for 3 years with no noticeable impact you
are probably safe to continue.

Possibly safe, but if used too often, accumulating acid may (I said may)
eventually cause harm to vegetation or concrete.
YMMV snicker

--
Best regards
Han
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