It is definitely not normal for a freshly washed mirror to have so many speckles so close together like that.
It appears as though something has been sprayed on the surface.
Has the mirror looked like this for a while, even before removing to wash?
What did you wash the mirror with and did you rinse thoroughly with water and distilled water as a final rinse.
I hope the chemicals, isopropyl and ethanol haven't reacted with something that may have been on the surface. In this case the speckled areas may be permanently etched, but not knowing your method of cleaning I can't say that for sure.
Cheers hope this has helped.
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