My rear view mirror was always cloudy. I had cleaned the glass but the contamination appeared to be inside. The opportunity to fix it presented itself when I hit the mirror with my head and knocking it off the windscreen while working on the interior.
The Ferrari’s mirror has a pane of polarized glass in front of the mirror glass with a gap in-between that seems to attract, dust, grease and all manner of other contaminants. Disassembly for cleaning is simple. The plastic housing has four plastic clips holding everything together. Before reassembly I lubricated the dipping mechanism.