Remove Hard Water Build Up Off Brick???

Anyone ever had any luck removing hard water builduo from sprinklers off of brick walls??? I never have but I'd like to learn how. I have some One Restore and I can get some Muriatic acid. I know oxalic acid doesn't work nor will the ZEP brand of products...

What have you used? How do you use it? What are the precautions??

Thanks in advance!!!

Daniel Simmons
http://www.houstoncommercialpressurewashing.com/warehouse-cleaning.htm
http://www.houstoncommercialpressurewashing.com/office-building-cleaning.htm
 

Doug Rucker

Roundtable Host 2009
Spray on full strength, let sit 5 minutes, spray on again full strength, let sit 5 minutes, pressure wash off and angle downward so as not to push it back into the brick. I only scrub if it's real heavy. I did not scrub these.
 
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