"G Mulcaster" wrote:
Over the last three years I've been spraying strength vinegar on my
cement based pavers to kill moss and weeds.

You are using the wrong chemicals. Use glyphosphate for the weeds and a
zinc formula for the moss; both are available as a concentrate to be mixed
with water and applied in accordance with the instructions. Both are safe
if used appropriately.

Trying to use folksy home remedies is going to cause more problems in the
long run than just using the proper, modern solution the first time.

Jon