Autoglym Magma Review

Last Updated on September 20, 2026 by Stewart

Autoglym Magma is a fast acting and paint protection safe iron fallout remover. During testing on two cars over a 12 month period, it gave excellent results, with it breaking down the iron on heavily contaminated paintwork and also brakes.  The thicker, gel like consistency of Magma increased the dwell time, allowing it remove more iron as opposed to other brands as it did not easily run off of vertical panels. There was no noticeable breakdown of the wax that was present on the car and it left the paintwork feeling smooth, minimising the need for a claybar.

12 Month Test Methodology on Protected and Unprotected Paint

Magma was tested over a 12 month period on two cars. One car was continually maintained in that it was washed weekly and always had a form of protection on it, be it Autoglym UHD Wax or Autoglym Rapid Ceramic Spray. The other car was washed monthly, and one that did not have any form of paint protection on it (this was an older car that the other didn’t care much for). Magma was used on both cars at 3 month intervals.

How To Apply Autoglym Magma Step By Step

1. Pre-Wash: Wash the car with a high quality shampoo, such as Autoglym UHD Shampoo and then dry it.
2. Apply: A few sprays of Magma are to be applied to each panel. For the roof, I normally apply three due to this being the largest part of the car. Do not do this in direct sunlight.
3. Let it dwell:  Allow up to five minutes of dwell time on the paint. During this time, it will react with the iron on the paint and turn a deep purple.
4. Safety tip: If it dries out on the paint, reapply a small amount of Magma to the affected area and rinse it off.
5. Rinse off and wash: Thoroughly rinse off the car again and re-wash it. I like to use a dedicated wash mitt as Magma can cause some stiffening to microfibre noodles.

Real World Performance on Iron Removal, Wax Removal and Wheel Cleaning

How well Magma performs is important to factor in. In short, it’s excellent. The five minute dwell time is more than enough to break down the iron particles on both the paint and the wheels. As it can be seen in the photo below, that was Magma applied to a wheel that hadn’t been cleaned beforehand. The visual colour change from a colour gel to bright purple indicate that Magma is not only attaching to iron particles, but actively breaking them down.

I have a video showing a wheel being cleaned as well, and then applying Magma to it.What this shows is that even after cleaning the paint or the wheels, iron fallout is still present and therefore needs a dedicated cleaner.

On the car that always had a paint protection product on it, I did not see any degradation of it which would have been due to Magma. Instead, the product degraded within the normal time frame as suggested by Autoglym.

After applying Magma and rinsing it off, I then applied it again to the paintwork. This was to see if one application of it was enough to remove the iron fallout from the car.

On the car that had the paint protection on it, one application was more than enough. On the car that didn’t have any form of wax or sealant on it, I noticed that this needed two applications of Magma to remove all of the iron from it.

This is to be expected as the iron is binding directly to the paint, instead of into the wax. When it binds to the paint, it makes it harder to remove.

I found this to be a great wheel cleaner, and it removed the heavily embedded iron particles from them.

It’s also important to note that unlike other iron fallout removers, this does not have a pungent smell to it. The smell is pleasant, and not egg like.

Alternative Iron Fallout Removers

There are other brands available, which all have their pros and cons.

For example, Bilt Hamber Korrosol can be purchased for cheaper than Magma. However, it is a strong scent to it which many may find off putting. It also doesn’t react as quickly as Magma.

Gtechniq also offer their own iron fallout remover. This does work faster than Magma, but it is also more expensive and it too has a slightly stronger smell.

Cost Analysis

The price of it does go up and down on sites such as Amazon and Halfords. However, the benefit of Magma is that unlike some iron fallout removers, it is safe to use all over the car. What I really like about it as well is the fact that only a few sprays are needed. There’s no need to add a thick coating of Magma all over the bodywork on the first application.

In addition to this, it is pH neutral and therefore it isn’t going to cause any rapid deterioration to any waxes or sealants on the paintwork, regardless of how long they’ve been on for. This in itself if going to save you money since you don’t need to reapply coatings after using Magma.

It is also a product that does not need to be applied every wash. Generally speaking, every three months is enough to keep on top of iron fallout contamination on the car.

As of August 2026, Magma is available for £12 for 500ml or £40 for 2.5 litres. Both offer excellent value for money, although I would personally recommend going for the 2.5 litre variant as this is the more cost effective option. If this is the chosen variant, then a spray bottle will also be required.

Autoglym Magma, Iron Fallout Remover, 500ml

• Colour Transform Technology reacts with iron particles on your bodywork and wheels so they can be easily rinsed away for a deep clean

Buy on Amazon

Last update on 2026-10-15 As an Amazon Associate I earn from qualifying purchases.

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Autoglym Magma, Iron Fallout Remover, 2.5L

• Colour Transform Technology reacts with iron particles on your bodywork so they can be easily rinsed away for a deep clean

Buy on Amazon

Last update on 2026-10-15 As an Amazon Associate I earn from qualifying purchases.