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Michelle garton

  • Posts: 3
Cleaning old brick New
« on: November 04, 2018, 04:46:33 pm »
Hi guys .got area to clean about 20x2m.The dark red brick is old and smooth.it is covered in black staining got a cold petrol jet wash and customer wants instant result.what's best chemical to use please.ive heard hydrofluoric acid based products do the job.ive tried biocides/hypo/hydrochloric but not removing staining.cheers
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