anti-bacterials

[cirillonb]

I have a phrag that got a bacterial infection on one leaf. I have removed the leaf and will need to get to the crown tomorrow. The slipper orchid expert in our club does not like Physan-20 claiming that Phrags roots don't do well with it(I have seen this mentioned elsewhere)
With all respect, I find using cinnamon a bit of witchcraft... but that is what I did.
My medical background abhors poring tons of hydrogen Peroxide onto the plant/roots as it denatures proteins (but I did that too since all the orchid experts can't be wrong.)
What I am asking is, besides Hydrogen Peroxide, Cinnamon and Physan-20, what other antibacterials, or antibacterials are available in the orchid world.
thanks
Nick