[APWS]

i'm having trouble cleaning these bricks on a new build i'm working on, the bricks are like a red enginneer brick, i am mixing strong solutions of brick acid washing them at least twice sometimes three times & there are still cement like stains that will not shift,
i have cleaned red brick before though not the easiest brick to clean never had anything this bad,
any idea's,
thanks.

[brilhoservices]

Always use adequate safety precautions!Reduce the need for acid cleaning by cleaning ‘as you go’ during laying.
Ensure sufficient pre-wetting of the brickwork prior to applying hydrochloric acid. Apply an acid solution of the correct strength. Acid solutions that are too strong are a problem.Ensure that the brickwork is sufficiently rinsed after cleaning.
Light coloured bricks should be rinsed with a neutralising solution.

[Matt Gibson]

Wire brush