Well now this is a whole new world of razor cleaning to me.
First below pic is my Post War Tech with a light polish with AutoSol, which is mildly abrasive and I didnt want to harm the frosting on the plate. I assumed those lines wouldnt come out without also removing the frosting or otherwise damaging the finish.
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I took the razor apart and only wet the cap under a tap, dusted some Barkeepers Friend onto it and rubbed it with my thumb, rinsed and did it again and below is the result.
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Thanks again to AlphaFrank75 You nailed it on this one.