Koch-Chemie Felgenreiniger extrem "Fe" wheel cleaner 11kg

Shift baked-on brake dust with Koch-Chemie Felgenreiniger extrem "Fe"

What is Koch-Chemie Felgenreiniger extrem "Fe"? An HCl-based pro concentrate at pH -0.2 that dissolves baked-on brake dust, rust film and cement haze on steel wheels, painted alloy wheels and shop floors. Not for polished aluminium, magnesium, chrome or marble.

Koch-Chemie Felgenreiniger extrem "Fe" is an extremely acidic specialist cleaner from Koch-Chemie, built on hydrochloric acid (HCl), that chemically dissolves inorganic grime like baked-on brake dust, iron oxide and limescale haze. At a pH of -0.2 it sits among the strongest cleaners in the Koch-Chemie range and it's a pure shop and industrial product — no pack size under 11 kg, no spray bottle, no consumer format.

• pH -0.2 for baked-on grime that shrugs off everything else. The HCl-based formula cuts through brake dust that's been baking into the wheel surface for 6 or 12 months without a clean. Dilute it 1:2 to 1:10 and 11 kg of concentrate turns into up to 110 kg of working solution.
• Three pack sizes for the shop, the detailer and the big operation. 11 kg canister for the shop, 22 kg canister for the detailing business, 225 kg drum for wash bays and industrial sites. No smaller packs — if you want a spray bottle, you're on the wrong product.
• More than a wheel cleaner. It cleans steel wheels and painted alloy wheels, but also wash-bay tiles, commercial vehicles, construction vehicles and shop machinery. Anywhere inorganic grime sits on acid-resistant material, the "Fe" is the right tool.

Detailing1's tip from the shop: Always pre-wet the surface. Laid down dry, the acid reacts too fast and bites into the surface harder than it needs to. A water pre-wet slows the reaction and spreads the concentrate evenly. The second common mistake: leaving it on too long. At pH -0.2, 30 to 90 seconds is plenty — after that the product belongs blasted off with a pressure washer. Letting it dry on causes material damage, not "a little longer for more cleaning".

Pre-wet, dilute 1:5, 60 seconds, rinse off

You don't run the Fe neat. Standard dilution is 1:5 with water, up to 1:2 for extreme grime, up to 1:10 for light grime. That turns 11 kg of concentrate into 33 to 110 kg of working solution — one litre of ready solution costs between 0.72 and 2.40 EUR depending on the dilution.

Before you lay it down, hose the wheel down thoroughly with water. This pre-wet isn't optional. It slows the acid reaction, spreads the concentrate better and cuts the risk of streaking and spot material damage. Apply it with a low-pressure sprayer or brush from the bottom up, so run-off marks don't dry on. On vertical surfaces like wash-bay tiles, work in 1-metre lanes so the concentrate doesn't run over areas you've already done.

The order matters around the tyre. First mask the tyre sidewall or apply the dilution precisely — hydrochloric acid can bleach tyre markings. Then work the wheel itself, always from the same rotation position so no area gets missed. After rinsing, check it visually and only go for a second pass if there's grime still showing — with a properly dosed first pass that's rarely needed.

Dwell time is 30 to 90 seconds. As soon as you see a reaction (foaming, discolouration), work it straight away with the wheel brush and rinse off thoroughly with a pressure washer. Several short passes beat one long one — the acid is saturated after 2 minutes max and does nothing but damage after that. PPE is a must: acid-resistant gloves, safety goggles, long-sleeved work gear. Rinse any splashes off your skin immediately with plenty of water.

Steel wheel yes. Polished alloy no.

The Fe is built for acid-resistant materials. Steel wheels, painted alloy wheels with intact clear coat, wash-bay tiles and commercial vehicles all qualify. Its cleaning power on baked-on brake dust from trucks, buses and construction machines is unmatched across the trade — no acid-free alternative comes close to that depth.

The chemistry is clear: hydrochloric acid dissolves iron oxide (Fe₂O₃) out of the brake dust and converts it into water-soluble iron chloride, which flows away with the rinse water. The same principle works on limescale (calcium carbonate), cement haze after building work and scale in wash bays. Inorganic grime dissolves in seconds; organic grime like tar, oil or insect residue isn't touched — that needs a solvent or surfactant cleaner.

The speed advantage is genuinely measurable. Acid-free wheel cleaners working via thioglycolate need 3 to 5 minutes of dwell time per pass and often two or three passes on baked-on brake dust. The Fe dissolves the same grime in 30 to 90 seconds in a single pass. In a detailing business with ten vehicles a day, that's a time saving of 60 to 90 minutes — costed as an hourly rate, the investment in the big pack pays for itself within a few weeks.

Where the Fe destroys on contact: polished aluminium with no paint protection, magnesium, chrome (attacked too, even lightly), zinc, marble, natural stone and all anodised surfaces. A pH of -0.2 is practically concentrated hydrochloric acid — this is industrial chemistry, not detailing care. Before the first use on any unknown surface, test a hidden spot, at least 5 cm² for 30 seconds, then rinse off thoroughly and check it visually.

If the wheels are polished, chromed or uncoated, grab the acid-free Koch-Chemie Felgenblitz "Fb" — it works through iron-binding agents instead of acid and is safe on all common wheel types. If the wheels are painted, carry little brake dust and you clean them regularly, an acid-free cleaner is enough too. The Fe only justifies itself when the brake dust is baked on and acid-free cleaners hit their limit.

Shop, detailer, wash bay and depot

The Fe is not a consumer product. It belongs in the shop, in the detailing bay and in the wash tunnel. Use it privately in your home garage and you're buying 11 kg of concentrate for a job an acid-free cleaner solves just as well in a 1-litre format — at far less risk to the wheel and to your own health.

The typical use cases are easy to name. Detailers with several vehicles a day need the fast, deep action on first-time clean-ups of neglected cars. Workshops with a tyre-change service use it during wheel swaps — above all in spring after the winter season, when road salt and baked-on brake dust sit together on the steel wheel.

Truck and bus wash bays run it as their main cleaner against brake dust and road grime. Construction firms clean their vehicles of cement and limescale residue after a job. Building cleaners work with it on shop tiles, in maintenance halls and on industrial floor surfaces when limescale deposits, rust marks or cement haze need to come off.

For the buying decision it comes down to the pack. The 11 kg canisters are the right format for workshops with occasional need and detailers doing one or two vehicles a day — at 1:5 dilution they last for around 250 wheel sets. The 22 kg canister pays off for detailing businesses and smaller wash bays.

The 225 kg drum with pump system is the standard size for truck wash bays, large operations and building cleaners with daily use. The price per kg drops by about 12 percent from the 11 kg pack to the 225 kg drum — the bigger investment pays off from steady daily demand. If you're unsure which pack fits, start with the 11 kg canister and step up once you're going through three canisters a quarter.

As a complete setup you pair the Fe for the first clean with the acid-free Felgenblitz "Fb" for regular follow-up cleaning — that way you limit acid use to what genuinely can't be shifted acid-free. For tyre care afterwards, reach for a regular tyre dressing. Store in the original canister, frost-free, away from food, kept separate from alkaline cleaners (reaction risk).

Within the Koch-Chemie wheel cleaner family, the Fe sits at the top of the acidic line. If you need even more cleaning power and want to work with a three-acid blend, go for the Triple Acid Star "Ta". If you want to work acid-free and you've got baked-on brake dust, you accept several passes with the Felgenblitz or Reactive Wheel Cleaner. You take the Fe when it has to be cleaned fast, thoroughly and only once — in exactly the industrial field the HCl-based pro formula from Koch-Chemie was originally built for.

Application of Koch-Chemie Wheel Cleaner extrem "Fe"

Pre-wet, dilute, apply, allow to act briefly, rinse off

Before application, the surface to be cleaned is thoroughly pre-wetted with water. This pre-wetting is not optional — it slows down the reaction of the hydrochloric acid and distributes the concentrate evenly. If applied dry, the cleaner reacts too quickly and attacks the surface more aggressively than necessary.

The concentrate is diluted with water at a ratio of 1:5 — up to 1:2 for extreme soiling, and up to 1:10 for light soiling. Apply with a low-pressure sprayer or brush from bottom to top to prevent drip marks from drying. For car wash tiles and vertical surfaces, work in 1-meter sections.

The exposure time is 30 to 90 seconds. In case of a visible reaction (foaming, discoloration), immediately rework with the wheel brush. Then rinse thoroughly with a high-pressure cleaner — the acid must be completely removed. Several short applications are better than one long application with a longer exposure time.

Personal protective equipment is mandatory: acid-resistant gloves, safety glasses, long-sleeved work clothing. Immediately rinse splashes on the skin with plenty of water. In case of eye contact, flush eyes under running water for at least 15 minutes and consult a doctor.

Notes: Never apply to hot surfaces — the reaction will then proceed uncontrollably. Not for polished aluminum, magnesium, chrome, zinc, anodized surfaces, marble, and natural stone. Before each first use on an unknown surface, test an inconspicuous spot (5 cm², 30 seconds). Do not mix with alkaline cleaners — the reaction generates heat and can cause splashes. Store in the original canister at 5 to 30 °C, frost-free, separated from food and alkaline products. Pure professional product — keep out of reach of children or untrained personnel.