Glad you have posted this.
I have the same issue & have never had such a problem on any other vehicle. I only started noticing it as the recent bad weather arrived and the gritters were out so at first I thought it may be a road film residue
My discs are heavily grooved but pads are not worn down. There is no binding of the brakes causing heat to bake the residue on. The rust residue(if that is what it is) has to be removed with fine cutting compound as you have done. Very time consuming.
The vehicle is up for it's first MOT in April and is covered by the Volvo Selekt First MOT warranty. It will be interesting to see if they get changed. If not I'm changing them myself.
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