try using a finer polish.... ( you may have done this already...) but I've found that some polishes are inconsistent and can actually cause scratches in softer alloys.... that paste polishes in particular. Microfiber is very very soft... but if it's contaminated it can hold on to debris and cause what you're seeing as well... they're cheap and available so try using a "new" or freshly washed one for your aluminum and billet parts.... then after one use relegate them to different uses that dont matter so much.
JMHO
KT.
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