Repair Systems — 03 — Facade & External Envelope
Masonry cleaning — acid wash
Technical product reference for acid wash masonry cleaning systems for masonry facade remediation on Australian Class 2 strata buildings. Covers dilute hydrochloric acid and proprietary phosphoric or sulphamic acid-based cleaners for efflorescence removal, mortar stain removal and general masonry surface preparation — acid washing dissolves calcium-based mortar salts and efflorescence deposits that cannot be removed by water or pressure washing alone.
Masonry acid wash cleaning types
Select the acid cleaning type below to compare products, technical data, and procurement sources.
Hydrochloric Acid
5–10% HCl — for clay brick mortar smear and efflorescence — NEVER on calcium silicate or marble
Phosphoric Acid
Gentler alternative to HCl — for rust stains and efflorescence — suitable on a wider range of masonry types
Sulphamic Acid
Powder form — specifically for calcium-based efflorescence and carbonate deposits — lowest risk acid option
Disclaimer
This page provides general technical information only. Acid cleaning product selection, dilution ratio and application method must be confirmed for the specific masonry type and stain — never apply acid cleaners to acid-sensitive substrates. OH&S requirements for chemical handling must be complied with.