Dark brown tannin staining on concrete from Queensland's gum trees, figs and mangoes is extremely common — and resistant to standard hosing. Professional cleaning removes it completely.
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Leaf tannin staining on concrete driveways, paths, patios and pool surrounds is one of the most common exterior staining problems in Queensland. Eucalyptus and gum tree leaves, Moreton Bay figs, mango trees, Jacaranda flowers and most Queensland native trees produce tannins — natural organic compounds that leach from fallen leaves as they decompose and stain concrete a distinctive dark brown colour. On porous concrete, these tannin compounds penetrate progressively deeper over time and become increasingly resistant to removal. Burnett 2 Bay removes leaf tannin staining from concrete across Redlands, Brisbane, the Gold Coast and all of South East Queensland.
Tannins are polyphenol compounds found in high concentrations in the leaves, bark and fruit of many Queensland tree species — particularly eucalyptus, Moreton Bay figs, mangoes and Jacarandas. When leaves fall and decompose on concrete, water carries these tannin compounds into the porous concrete where they oxidise and create characteristic dark brown staining. Wet weather accelerates staining significantly.
Concrete pool surrounds are particularly susceptible to tannin staining — they are in contact with water and leaf debris constantly. Regular cleaning prevents the progressive build-up that becomes harder to address over time.
An oxidising or bleach-based cleaner breaks down the tannin compounds in concrete. The same chemistry used in soft wash solutions for roof cleaning is effective on tannin staining — sodium hypochlorite oxidises the tannin compounds and allows them to be rinsed away at appropriate dilution.
Regular sweeping and prompt removal of leaf matter significantly reduces tannin staining. Concrete sealing creates a barrier that prevents tannin penetration and makes cleaning much easier.
Yes — oxidising cleaners break down tannin compounds in concrete. Fresh staining responds well. Long-established staining may require multiple applications.
Dark brown staining under trees is almost always leaf tannin — organic compounds from decomposing leaves that penetrate porous concrete as they break down in water.
Yes, if trees continue to shed leaves over the concrete. Regular cleaning and concrete sealing are the most practical management approaches.
Included in our driveway and path cleaning service. Contact us for a free quote.
Based in Redlands, serving all of South East Queensland. Reply within 2 hours Mon–Sat.
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