Wow, that was dirty. Send me some more pics so I can put on my blog......
I have used O2 several times, but my juice of choice is
prochem acid mixed appropriate to grout condition with 2-3 oz/gal of citrapure. I used this side by side yesterday with two other combos and it won out easily.
Dave, Mikey sold me on the brush ring about a year ago. I had only used it once and didn't like it. So I kept the teflon ring on it until I did a solid surface and needed to change it. Never changed it back yet. I do like it better. Main thing is you can soak the floor down with juice and it helps pick up the extra liquid. Try it, you'll like it.
bc