side story... my daughter went on my route as my "chauffeur" - she's got her learners permit. So, I paid her to be my "Test&chem" while I did the cleaning...
Here first attempt at pH adjustment (and, I warned her ahead of time...) was quite interesting... she got a good whiff of MA, and says to me, "this stuff is truly evil!".
3 or 4 more times it took her before she got to really think about "wind direction".