UPDATE - This is the situation after about a month of doing nothing (see pic below).
The wet look patches have receded quite a lot. Possibly through a combination of rain washing away any acid residue and general weathering.
Will leave for another month or two to see if the drive returns to a...
Did you ever find a solution for this? Or did the slow passage of time bring things back to a more uniform finish?
Im asking because I have today posted about an almost identical scenario - https://www.diynot.com/diy/threads/acid-stains-on-driveway.649826/#post-6088958.
I think the size of the dry patches are largely the same but can't be sure without taking a picture each day (which I might now do for a week or two and report back)
I did wonder if that pattern was the acid settling in the joints between the blocks and therefore changing their colour in that way.
We've had some building work done and it's been very tricky to get the contractor back to do the final bits of snagging/clean up.
One such job was the removal of some cement staining on the drive where the mixer had been positioned.
Never mind, a job well within my DIY competence (or so I...