little brown specks I get them from the shavings from drilling into steel (even stainless). The cure for me has been FSR (Fiberglass Stain Remover). Its a gel that you apply to a dry surface, let it set for a minute or two, and then it it with a hose. Stains go away. Stuff works very well. It is blue in color and comes in a opaque container so you can see the color. Costs a bit, somewhere around $8 a tub as I recall. Lasts a long time ans works very well on all sorts of stains though. Worth having a can around.
Thom
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