Used an SiC brush bit of alkaline and water spent around a minute per m2 to remove it and its hands and knees job
...a minute per square metre eh?
How crap is the brush again???
If you bought a decent machine like a Samich Lotus and a planitary, you can fit 3 crap brushes on. But you decided to buy one from KM, the Levi will simply flatten the crap brush.
Wouldn't listen would you
No hands and knees for me!!