Start the repair by picking away as many loose pieces of the broken mirror as you can. Wear leather gloves and eye protection while doing this. You can leave the old adhesive in place. Then clean the remaining glass and the plastic mirror base with glass cleaner.
The new glass comes with adhesive strips on the back, but don’t rely on those strips alone to keep the glass in place. Apply a thick bead of black rubber sealant 3/4 in. in from the perimeter of the plastic mirror retainer. Put a few large dollops of the sealant on the honeycomb portion of the plastic base and a few more on the old broken glass. Don’t apply the sealant in areas where the adhesive pads will contact the plastic base. The pads must make contact with the plastic base to hold the new glass in place while the sealant sets up.
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