One or even a few small sleeks on a mirror coating are hardly fatal to a reflective optic, they have no effect on performance and can be ignored.
I am surprised you were not advised of that. ( I have seen the occasional small sleek on new $45K scope mirrors...the optics are still effectively perfect and the sleeks go away after the next re-coat..)
Trying to polish out coating sleeks is just plain dumb. Aluminium is just too soft for that.
That mirror now needs re-coating or replacement IMHO.
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