sledger
May 10, 2011, 11:45 PM
The mortar is well intact but looks real grungy/dirty
ma0641
May 12, 2011, 01:08 PM
Get some TSP and mix it per the package. Get some heavy duty neoprene gloves and a very stiff bristle brush Start scrubbing. This stuff will eat up your hands so be sure to wear gloves.
ballengerb1
May 12, 2011, 03:53 PM
ma0641 gives good advice but test a small spot out of the way. Once dried the cleaned area may not long significantly better.