Outdoor Tile & Grout Cleaning
Outdoor tile and grout cleaning Sydney: black algae killed in the grout where it lives, tiles cleaned at surface-safe pressure, and grout sealed so pool surrounds and patios stay clean.
Tiled outdoor areas have a weak point, and it isn’t the tile. Glazed porcelain and ceramic barely stain — but the grout between them is porous, absorbent and permanently damp in shade, which makes it perfect habitat for the black algae and mould that turn a smart tiled area grimy and slippery.
Why tiled areas go black — and slippery
The organism establishes in the grout joints first, then spreads a biofilm across the tile surface. That film is what makes tiles treacherous when wet. On a pool surround, a balcony or an entry stair, that’s not a cosmetic problem; it’s the most common slip hazard on an Eastern Suburbs property.
Pressure alone strips the visible film but leaves the organism rooted in the grout — which is why cheaply cleaned tiles look good for a season and are black again by winter. We treat the grout with a biocide, let it work, then clean at a pressure the tile finish can carry.
What we clean
Tiled patios and entertaining areas, pool surrounds and wet edges, balconies and terraces, entry paths and stairs, verandah tiles (including original tessellated tiles on period homes, which are cleaned with particular care — they’re irreplaceable), and commercial tiled forecourts.
Tile types and how they’re handled
Porcelain and glazed ceramic take moderate pressure comfortably. Terracotta is soft and porous — low pressure and the right chemistry, or the surface furs. Natural stone tiles (travertine, limestone, sandstone, slate) are treated as stone, not tile: chemistry first, gentle rinse, never blasted. Tessellated and encaustic tiles on Victorian and Federation verandahs are hand-and-low-pressure work only.
Sealing the grout
Once clean, grout can be sealed. Sealed grout stops drinking the moisture and organic matter that feed regrowth, resists staining, and keeps the whole area looking finished dramatically longer. On pool surrounds and shaded courtyards — the two areas that go black fastest — it’s the difference between an annual job and a once-in-several-years one.
Get a fixed written quote
Itemised by surface, priced before we start, and never finished until you've walked the property with us.
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