Bilt Hamber Korrosol Review

Iron fallout that hasn’t been addressed is one of the most common reasons why I see things like wax and sealants fail. Bilt Hamber Korrosol is, without doubt, one of the best fallout removers in the business.

It may come as little surprise to those familiar with the Bilt Hamber brand to hear they’ve once again knocked it out of the park, but for those that are new, you’re in for a treat. Not only does the product remove a huge number of contaminants from the car’s paint, but it’s easy to use and great value for money at the same time.

Prepmycar Rating: 8 / 10

Bilt Hamber Korrosol (1 Litre)

Bilt Hamber Korrosol (1 Litre)

  • 8.5 Ease of Use
  • 9  Fallout Removal
  • 8.5 Value for Money
  • 8  Bottle Ergonomics
  • 7.5 Scent


  • Fantastic on removing iron build-up
  • Removes more than almost all of the competition
  • Great value for money
  • Very easy spray-on/rinse-off method
  • Smells much better than most in this category


  • Not as good on wheels as some

Bilt Hamber Korrosol – Testing Process

This a hard product to test in terms of measurable results, but I have used it for well over a year now and have had time to compare it with other products. It is easiest to notice the effects of an iron fallout remover on lighter coloured surfaces, like white paint and alloy wheels. Bilt Hamber Korrosol has been used on surfaces that have been washed by a contact wash, in order to remove any other contamination.

The product is then sprayed on the dry surface and left until the iron particles. Once no more colour change has taken place it is simply rinsed off the paintwork with water and then re-washed to remove any traces of the chemical.

Ease of Use          

This product comes ready to use, so it does not need to be diluted in any way. The only necessary step prior to use is that the surface has been washed and is cool and dry.

If the car is in direct sunlight the product will dry very quickly and may cause staining. The product is easy to rinse away after the reaction is complete.

Fallout Removal

As with all fallout removal chemicals, Korrosol turns a dark shade of purple when it reacts with iron particles. To test how much fallout was removed, I applied Korrosol as normal and waited for the reaction to complete before rinsing the surface. I then reapplied Korrosol and did not spot any purple at all, indicating there was no iron to react with and that one application had been sufficient to remove all contamination.

I did on one occasion need to make several applications in order to remove heavy build-up that had been caused by a seized brake, but this is not usually needed.

Wheel Use

Korrosol can be used on wheels, which are prone to picking up iron fallout. This is not a dedicated wheel cleaner. Bilt Hamber makes a product in that category: Bilt Hamber Auto-wheel, which is more viscose and foams up better than Korrosol, making it more suited to cleaning dirty wheels.

After wheels have been cleaned with a wheel cleaner, Korrosol could be used to remove any embedded iron particles left in the wheels, which can cause corrosion over time.


Fallout removers are renowned for having a terrible smell, akin to rotten eggs. CarPro IronX is one such example. Korrosol is the exception to this rule, and actually has a reasonably pleasant smell, so if the scent would be a big factor when deciding what fallout remover to buy, Korrosol is a good choice.

Value for Money

Korrosol is usually sold in 1-litre bottles but can also be bought in 5-litre containers. The cost of a 1-litre bottle is usually in the region of £16.00. The amount of product needed will obviously depend on how much contamination is present and how large the car is. 5 sprays per panel would be enough to get good enough coverage to remove contamination.

Each spray from the trigger is approximately 1ml and I used approximately 50ml to cover a mid-size SUV. This would then cost around 80p per car.

It’s a more than fair price for the results obtained, and it is worth noting that this chemical does not need to be used with every wash.

Bottle Ergonomics

Bilt Hamber makes high-quality bottles and triggers. They recently rebranded which involved changing the shape of their 1-litre spray bottles from a rectangular shape to a cylindrical shape. The new bottles are less liable to tip over, however, being a litre in size they may be heavy to use for some users.

About Bilt Hamber

Bilt Hamber is a well-known UK manufacture of detailing products, corrosion treatments and surface protectants. They manufacture popular detailing products such as snow foams (Bilt Hamber Auto Foam), waxes and clay bars.


How often should I use an iron fallout remover?

A fallout remover like Bilt Hamber Korrosol should be used every six months to a year. Even frequently cleaned vehicles will have some built up of fallout which can lead to corrosion over time.

Should I use Korrosol on glass?

You can use Korrosol on glass, but it is unlikely that fallout will embed in the glass. For this, you're better off using a dedicated glass cleaner or even a clay bar to remove embedded contaminants on glass.

Will Bilt Hamber Korrosol strip wax?

Korrosol will slightly wear away a wax layer, but is unlikely to completely strip wax, especially if it has been recently applied. If the sealant or wax has had iron fallout embedded in it, using Korrosol can result in an improvement in water behaviour.

Bilt Hamber Korrosol – Final Thoughts

Fallout removers have become an essential part of a detailing toolkit due to the amount of contamination it removes. For me, Bilt Hamber Korrosol is definitely a top contender for the best fallout remover. Few come close to the value for money you get with this product or the performance it gives.

It is also a very easy product to use, the effort made to improve the scent of the product makes it more pleasant for the user. It is a product that can be used by both enthusiast and professional detailers.

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