The following case describes the absolute perfect storm for severe, long-term iron contamination.
Here I break down typical driving and washing habits to explain what happens over the life of your vehicle.
When you use your brakes, microscopic metal shavings fly off at temperatures exceeding 150 Centegrade. They aren't just sitting on your paint; they are hot enough to melt a tiny pocket into your clear coat and fuse to it.
Normal shampoo just glides right over them.
If you don't chemically dissolve them, they will sit there, react with moisture, and begin to rust. As iron rusts, it expands to four times its original size, slowly rupturing your clear coat from the inside out.
City driving is where iron fallout thrives. In a city, drivers are constantly accelerating and braking between traffic lights, junctions, and roundabouts.
Supermarket car washes that operatate in the car park are high-volume, fast-turnaround businesses. They focus strictly on making your car look clean to the naked eye as quickly as possible.
Remember: Urban driving is what counts, regardless of milage, a vehicle with as little as 5K miles will need to be decontaminated.
And in an ideal world, NEVER use a high volume supermarket service to clean your investment.
This is what I see every time I clean a car that's never been decontaminated.
When you use your brakes, microscopic metal shavings fly off at temperatures [..]
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