Stainless Steel and Metal Cleaning in Commercial Buildings

Stainless steel is the most visible metal in a commercial building and the easiest to ruin. It is not stain-proof, it is not scratch-proof, and the wrong cloth in the wrong direction leaves a permanently hazed panel.

This guide covers stainless steel cleaning and the care of other architectural metals: what each metal tolerates, how to work with grain rather than against it, and how to inspect metal surfaces.

Key takeaways

• Stainless steel is stain-resistant, not stain-proof. Chlorides are its main enemy, and they are in many everyday products.
• Always work with the grain. Cross-grain wiping leaves visible scratches that cannot be polished out.
• Use the mildest chemistry and the softest cloth that does the job, because abrasives cause permanent haze.
• Rinse and dry. Residue and water spots are the two most common reasons metal looks dirty.
• Never mix products, and never let an acidic descaler sit on metal.
• Deep scratches, dents and corrosion pitting are specialist restoration or reportable asset issues.

Know the metal and its finish

Architectural metals behave differently, and the finish matters as much as the alloy.

Always determine the finish before choosing a cloth. A non-scratch pad, a microfibre cloth and a soft brush cover most architectural metal; nothing else belongs on a mirror-polished panel.

The grain direction rule

Most stainless steel in commercial buildings is brushed, which means it has a visible linear grain. This is the single most important thing to know about cleaning it.

• Identify the grain first, usually horizontally on panels and vertically on columns and door frames.
• Wipe along the grain, never across it. Cross-grain wiping drags soil into the surface and leaves hazing that only becomes obvious in raking light.
• Change cloths often, and use separate cloths for cleaning and polishing so you are not redistributing soil.
• Do not use circular motions, however natural they feel on a tap or a handrail.
• Check your work in raking light. Most metal haze is invisible from directly in front.

The daily method

Metal cleaning rewards a short, consistent method over aggressive chemistry.

1. Dust and remove loose soil with a microfibre cloth or soft brush, because wiping dusty metal with a wet cloth makes mud.
2. Apply a mild pH-neutral cleaner to the cloth rather than directly onto the metal in most cases.
3. Work along the grain with light pressure, section by section.
4. Rinse with clean water, especially after any alkaline product, then dry immediately with a clean, dry microfibre cloth. Water spots are mineral deposits that etch some finishes over time.
5. Polish with a dry cloth in the grain direction, then inspect in raking light and redo any panel that hazes.

Water alone will not remove grease from handrails and push plates. Finger oils need a small amount of surfactant, which is why a diluted pH-neutral cleaner outperforms plain water.

Fingerprints, grease and high-touch metal

• Push plates, handles, door pulls, elevator panels and stair rails are the highest-touch metal surfaces in a building and soil fastest, so clean them several times a day in busy lobbies.
• Use a purpose-made stainless cleaner for high-touch panels; some leave a thin protective film that resists fingerprinting.
• Avoid oil-based polishes and furniture polish on doors and panels. They attract dust and smear, which makes the surface look dirty within hours.
• Clean elevator tracks and door edges separately from the panels, and never let a wet cloth drip into a track — critical.
• Report damaged or missing push plates, loose fixings and worn door hardware rather than cleaning around them — critical.

Food areas and equipment exteriors

Metal in kitchens, break rooms and food service areas needs different discipline.

• Exteriors only for cleaning contractors unless the contract and training say otherwise. Interiors of food equipment, hoods above the filters and refrigeration components belong to the operator.
• Food-contact surfaces must be cleaned and sanitised to the operator's procedures, often by trained site staff rather than a contract cleaner.
• Use food-area-appropriate products and follow the site's sanitation standard operating procedures.
• Clean and sanitise handles, controls, drawer fronts and door gaskets as high-touch surfaces.
• Never use the same cloth for a food-contact surface and a floor-level surface, and report damage to gaskets, seals or hinges and any corrosion near food areas — critical.

Our guide to food safety cleaning covers where the cleaning scope ends and the operator's duties begin.

Brightening and polishing metal

Polishing means different things on different metals, and on stainless steel it rarely means "make it shine like chrome".

• Stainless steel polish is usually a light oil or protective emulsion that evens sheen and resists fingerprints. Apply sparingly, along the grain, and buff dry.
• Over-applying polish leaves a streaky film that collects dust. Less is genuinely more.
• Brass and bronze polish is abrasive and chemical, and removes a thin layer of metal each time it is used. On lacquered brass, polishing is harmful, so lacquered metals should be cleaned rather than polished.
• Do not polish mirror-finished stainless with anything abrasive, and test any polish in an inconspicuous area first. The equipment itself needs the same care, as covered in our guide to cleaning equipment maintenance.

Scope note: deepening grain, removing deep scratches, re-passivating welded stainless, repairing lacquer and restoring corroded panels are normally outside a cleaning contractor's scope. Confirm in writing what is included, and report rather than act on anything outside it.

Preventing corrosion and tea staining

Corrosion on architectural metal is usually a chemistry problem, and cleaning crews cause a surprising amount of it.

• Chlorides are the main cause of tea staining and pitting on stainless steel. Bleach, chlorine-based sanitisers, hard water and road salt all contribute — critical.
• Never leave a chlorine-based product on stainless steel to dwell. Apply, work, rinse, dry.
• Rinse thoroughly after any alkaline or acidic product, because residue causes staining as it dries.
• Do not use steel wool, wire brushes or abrasive pads. They leave carbon steel particles that rust and seed corrosion — critical.
• Do not use the same cloth on metal and on concrete or floors, because grit and cement dust scratch and contaminate.
• Control salt at entrances with matting and prompt cleaning in winter — critical, since salt is the most common cause of corrosion at door bottoms.
• Report tea staining, pitting, rust bleeds and galvanic corrosion where dissimilar metals meet as soon as they appear — critical. Early staining can sometimes be removed; pitting cannot.

Safety when working with metal

• Do not use compressed air to blow dust off metal surfaces or equipment. CCOHS advises against cleaning with compressed air, because it drives particles into eyes, skin and the air.
• Cut-resistant gloves where you are cleaning edges, louvres, grilles and damaged panels — critical.
• Eye protection when working overhead, when cleaning above head height, and when spraying — critical.
• Match gloves to the product using the manufacturer's data, and ventilate when using solvents, aerosols and strong polishes.
• Never mix an acidic product with a chlorine-based product. The reaction releases chlorine gas — critical.
• Report missing guards, exposed wiring, sharp edges and damaged fixings rather than cleaning around them — critical.

Inspecting metal surfaces

• Visible soil, film, streaks and polish residue
• Haze or fine scratches, and cross-grain marks — critical to report, they are usually permanent
• Water spots and mineral deposits, and fingerprints on high-touch panels
• Tea staining, rust bleeds, pitting — critical
• Corrosion around fixings, seams and dissimilar metal joints, to be reported every time
• Dents, bends, loose panels and damaged lacquer
• Sharp edges or exposed fixings — critical
• Water in elevator tracks or pooling on ledges, and grain direction not recorded on the checklist

Score metal in raking light and photograph anything you are reporting. Our guide to cleaning quality assurance vs quality control explains how to build that check into a programme rather than relying on whoever happens to be onsite.

Where this fits in the quality system

This sits under our APPA appearance levels, which sets out the standard the rest of these checks are measured against.

Frequently asked questions

What is the best way to clean stainless steel?

Remove loose dust first, apply a mild pH-neutral cleaner to a soft microfibre cloth, and wipe along the grain with light pressure. Rinse with clean water, dry immediately to prevent water spots, then buff with a dry cloth.

Why does stainless steel look smeared after cleaning?

Smearing usually comes from polish applied too heavily, cross-grain wiping, or residue left by an alkaline product that was not rinsed. Use less product, work along the grain, rinse and dry with a clean cloth.

Can you use bleach on stainless steel?

Chlorine-based products are a leading cause of tea staining and pitting, so they should not be left to dwell. If a chlorine sanitiser is required, apply it, keep to the contact time the procedure specifies, then rinse and dry.

How do you remove fingerprints from stainless steel elevator panels?

Clean the panel with a diluted pH-neutral cleaner along the grain, dry it, then use a purpose-made stainless cleaner that leaves a thin protective film. Avoid oil-based polishes on high-touch panels.

Can scratches be polished out of brushed stainless steel?

Light surface marks sometimes blend with a purpose-made polish, but deep scratches, cross-grain hazing and dents generally cannot be removed by cleaning. Re-passivating the surface is specialist restoration work.

Make metal care repeatable

Metal is unforgiving of improvisation. The crew that records the grain direction, the product used and the condition of every panel leaves the next visit with a method rather than a guess.

NeatScore lets you build metal care checklists by area, attach before-and-after photos to each item and flag critical issues such as corrosion, tea staining or sharp edges so they are escalated the day they are found. Try it free for 7 days, or see pricing.