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Sadly you're not alone, the W203 is particularly prone to this. All you can do is have it stripped, treated and repainted, but it will come back, it will just take longer if your body shop does a good job.
Had this on my old W210 estate. I took it to a body repair shop and they removed the rust and resprayed the wheel arch, having first installed a protective strip. It looked like a very thin membrane which helps protect the surface from the stone chips and other rubbish which gets thrown up. It was still rust free when I sold the car a couple of years later.
Cls350cdi in palladium,C200k in tenorite,Slk320 in red.
Hi,aside from what others have already said it's very important to regularly clean and dry all 4 arches not forgetting the inside lips where all the wet muck sticks.When doing this I carefully examine the arches to check for signs of chips or bubbling and treat them straight away.