Now Clicio says vinegar kills bonsai and that is what Leatherback uses.
What do I do?
Nope, I didn't say vinegar kills Azaleas, I have said vinegar CAN kill plants, including Azaleas.
If diluted like 1 teaspoon/L of water, it can be used. But the ph of the soil may remain the same, depending on how hard is your water.
So after some testing, where I killed some saplings using vinegar in higher doses, I have decided Miracid was way better for Azaleas.
Nowadays I use Kanuma and Peat and Pine bark to plant Azaleas in and the ph issue is gone, as well as the Miracid and the vinegar.