Washing Hardy Backer board

[tordell]

Hi,

Had someone call me and ask if we could pressure wash hardy backer board, I think I know what that is, It's like a harder grey colored dry wall. Anyway, it's a couple stories up, and painted. I've never heard of anyone power washing it before, so I thought I'd better ask.

Has anyone washed this before? If so, what precautions do you suggest, besides careful with the pressure? Any reccomended cleaning chemicals?

Any help on the subject would be appreciated.

Thank You,

Dave
Murphree's Pressure Washing

 

[CaroliProWash]

We've had success just using our regular housewash mix - same as for painted siding As always, we start as weak as possible and graduate as the need dictates.

 

[A-PLUS]

What Celeste said. Also check for oxidation, I have seen where the paint will come off if heavily oxides