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If it comes off or moves when going over with a microfibre, i doubt that it's marring :S
More like residue/oils left from previous polishing/waxing.
If you have any IPA handy that should remove the oils...
Clean with this: http://www.cleanyourcar.co.uk/engine-and-exterior/303-fabric/vinyl-convertable-cleaner/prod_487.html
Then either this: http://www.cleanyourcar.co.uk/engine-and-exterior/303-high-tech-fabric-guard/prod_175.html
or this...