# Cleaning efflorescence

**URL:** <https://pressurewashingresource.com/community/t/cleaning-efflorescence/40154>\
**Category:** Stains/Surfaces\
**Created:** [June 24, 2025, 7:31am UTC](https://pressurewashingresource.com/community/t/cleaning-efflorescence/40154 "2025-06-24T07:31:26Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![LukePressure](https://pressurewashingresource.com/community/letter_avatar_proxy/v4/letter/l/8edcca/32.png) [@LukePressure](https://pressurewashingresource.com/community/u/LukePressure)\
**Post date:** [June 24, 2025, 7:31am UTC](https://pressurewashingresource.com/community/t/cleaning-efflorescence/40154/1 "2025-06-24T07:31:27Z")

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Hey there,  
I’ve recently started a pressure washing business and have received an inquiry about leached mortar/efflorescence on black brick. I’ve read that hydrochloric acid can clean the brick but the brick for this job is black coated/glazed.

 ![IMG_2289](https://pressurewashingresource.com/community/uploads/default/original/3X/0/f/0f67577188150e51ba7eb7592bd7b55eb59668be.jpeg)

Does anyone know if acid would lighten, discolour or damage the colour of the brick?

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**Author:** ![OhioFloMo](https://pressurewashingresource.com/community/user_avatar/pressurewashingresource.com/ohioflomo/32/44431_2.png) [@OhioFloMo](https://pressurewashingresource.com/community/u/OhioFloMo)\
**Post date:** [June 24, 2025, 2:03pm UTC](https://pressurewashingresource.com/community/t/cleaning-efflorescence/40154/2 "2025-06-24T14:03:57Z")

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F9 Efflo is like 30% hydrochloric acid and they specifically say not to use it on glazed surfaces.

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**Author:** ![dcbrock](https://pressurewashingresource.com/community/user_avatar/pressurewashingresource.com/dcbrock/32/38857_2.png) [@dcbrock](https://pressurewashingresource.com/community/u/dcbrock)\
**Post date:** [June 24, 2025, 11:31pm UTC](https://pressurewashingresource.com/community/t/cleaning-efflorescence/40154/3 "2025-06-24T23:31:43Z")

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Pass on that, that’s next level stuff, possibly media/dry ice blasting

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**Author:** ![LukePressure](https://pressurewashingresource.com/community/letter_avatar_proxy/v4/letter/l/8edcca/32.png) [@LukePressure](https://pressurewashingresource.com/community/u/LukePressure)\
**Post date:** [June 24, 2025, 11:42pm UTC](https://pressurewashingresource.com/community/t/cleaning-efflorescence/40154/4 "2025-06-24T23:42:55Z")

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Yeah looks real tough. Thanks