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They can develop either during or after the shave. I'd just pay attention during shaving and if not occouring it is a drying and storage problem. Make sure the blade is dry and oiled before storage...

I have autosol which is made in solingen. Flitz and mass are more I have heard of. If you use the search you'll like come up with something. Got mine from the auto store. Hardware might have some...

They are probably water marks. Did they appear between shaves or slowly over time? If you have some crox put a touch on a rag and polish the area. Other mental polish should work too. Depending on...