Hey mate,
I had this happen on my mk4. Unfortunately all you can do is to remove the failed clear coat and then hit it with a machine to try and burnish (not polish) the surface of the colour. After this, layer with a few layers of synthetic sealant followed by some layers of wax. That should last maybe 4-5 weeks depending on sun exposure and quality of the paint and then th powdery white finish will come back.
It's an expensive, losing battle I'm afraid.
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