We live on nearly two acres in SE Qld and are in the process of having a smaller courtyard style fence erected out from our alfresco area. Up until now, our fully grown glamour coat German Shepherd has been allowed full access of this alfresco area and has left large dirty stained areas where he has rested on the concrete while wet (and most likely dirty).
Given that he won't continue to have access to this area, we are wanting to clean the concrete as best we can once the fence is fully erected.
To date, we have tried Truckwash and high pressure cleaning; sugar soap neat (and scrubbing); equal parts of white vinegar and metho (and scrubbing) and haven't noticed any discernable difference. A friend suggested liquid chlorine neat left for about five minutes and then hosed off with a high pressure cleaner, but I would be happy to hear others' suggestions.
Thanks in anticipation
TM.