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Coastal stainless that is never washed is a brown photograph. ASSDA’s tea-stain work and the old Alltrade caveat — 316 still stains in many marine atmospheres — agree. Care is not optional poetry. It is fresh water.
This journal will not sell you a miracle wipe or a coating that repeals the Southern Ocean. Alltradestainlesssteel.com.au is editorial. The metal still needs a hose, a drain, and an alloy that matches the postcode.
Why 316 still needs a wash
Molybdenum helps 316 resist pitting. It does not stop chlorides sitting on a horizontal rail and drying into a film. That film is the start of tea staining. Rough welds, dirt shelves and base plates that pond make it worse. Carbon-steel swarf from a site cut makes a uglier brown that people still call tea stain.
304 versus 316 is the alloy door. 304 outdoors on the coast is a callback. 316 outdoors on the coast is the default, not a force field. Marine-grade on a blister pack is still a nickname.
Sea spray is the everyday coastal chloride. It arrives dry and wet, onshore and in a southerly, and it loves a crevice. Pool water is a different machine: warmer, often chlorinated or saline, sometimes indoor and never dried by a breeze. A rail that lives between a surf club and a lap pool is doing both jobs. Read pool and marine fittings if the metal is in the splash or the water, not just in the air.
A schedule that is honest
- Rinse with fresh water. Start at the top.
- Neutral detergent if deposits stay.
- Soft cloth, with the grit if the finish is directional.
- Dry if you can; do not leave dirty water to evaporate into a chloride film.
- After storms, do it again.
Splash zones, pool edges and surf-facing rails need more. A tenth-floor inland-coastal rail needs less. Tea staining tells you when you are late.
Look at the rail, not the app
| Exposure | Starting interval | What usually changes it |
|---|---|---|
| Surf splash, beachfront rail, boat deck | Weekly, or after each salty blow | Horizontal slats, unsealed welds, no shade |
| Coastal street, onshore wind, open balcony | Fortnightly to monthly | Dirt shelves, A2 screws, nearby grinders |
| Inland-coastal suburb, some salt in the air | Monthly, and after storms | West faces that bake deposits |
| Covered outdoor kitchen, coastal | After cooks and after wind | Fat plus salt. See outdoor cooking stainless |
| Pool edge, air-side 316 | Weekly in season | Chlorinated mist, warm crevices |
| Indoor dry 304 | Ordinary kitchen clean | Bleach and brick acid still banned |
These are habits, not a standard you can pin on a certifier. ASSDA-type guidance has always been “wash often enough that salt does not stay.” The table is that sentence with Australian jobs written in.
Outdoor kitchens fail the same way as rails: horizontal faces, fat or salt, no hose. A barbecue lid is a salt tray with a handle. Peel the film after install — baked PVC is not a wash — and then put the lid on the same schedule as the rail. See protection during install.
What not to use
Bleach, brick acid, steel wool, and mystery “rust converters.” See cleaning without chlorides. If a renovator has already attacked the metal, stop.
Why the usual products make it worse
Household bleach is a chloride source. Residues pit and tea-stain, especially if they dry in the sun. Hydrochloric brick and concrete cleaners are worse. They are how a new 316 balustrade looks twenty years old after a paving tidy-up. Flood with fresh water if they have already hit the metal, then get advice before you polish.
Steel wool is carbon steel. It sheds into the grain and blooms. A pad that already scrubbed a rusty hinge is the same story. Keep a stainless-only cloth.
Coatings and “sealants” exist. Some yellow. Some trap moisture. None of them replace drainage, alloy and washing. Be sceptical of anything that promises you can skip the hose.
If staining is immediate and striped, you may have swarf or mixed metals — identify the grade before you buy a cleaner.
Design that makes care possible
Drain base plates. Avoid dirt shelves. Specify 316 and A4. Passivate at handover. Give the owner a one-pager, not a link to a brochure farm.
Balustrades and outdoor kitchens fail the same way: horizontal faces, fat or salt, no hose. The hose is the tool. The alloy is the ticket. Neither is enough alone.
Details that decide the first summer
- Fall on caps, lids and tops. No ponding.
- Base plates that drain, not cups.
- Welds cleaned of tint and passivated.
- A4 fasteners, labelled, not a mixed tin. The screw going first is the usual tell.
- Isolation from carbon steel, zinc and copper. A galvanised clamp on a 316 post is a couple.
- Film off after install, before the sun bakes it.
- A wash path a real person can use. A rail you cannot reach will not be washed.
Benchtops on a coastal deck still want 316, a wipeable upstand and no bleach. If the deck is also a food room, commercial kitchen requirements and coving apply. Hygiene and salt are not separate professions on an open terrace. The kitchens and hygiene hub and the marine, balustrade and outdoors hub meet at the same hose.
A one-page note for the owner
Write the alloy and the finish. Write “fresh water from the top, neutral detergent if needed, soft cloth with the grain, dry if you can.” Write “no bleach, no brick acid, no steel wool.” Write “after storms, do it again.” Write that 316 can still stain and that staining is a wash signal, not automatically a failed mill pack.
If the screws went first, replace with A4 and stop mixing tins. If the stain is a stripe under a site cut, you are looking at swarf, not the Southern Ocean. If the job is a kitchen by the sea, both the bench essay and this one apply.
Care is not a product. It is the humility to admit that molybdenum is not a raincoat. Specify the right metal, drain it, and wash it. That is the whole coastal method.