RG wrote:
I find your comment rather strange, since my reply was entirely serious
and factually correct.

It may have been aimed at the person you replied to rather than you.

Another possible garden use for phosphoric aid is to clean concrete paths,
but in a stronger concentration than Coke.

I used half a bottle of diet cola to clean my bike chain recently after it
rusted. Did a spankingly good job, I must say.