Tomaru, Marc, Yuhang, Michael, Aso

We inspected the HR surface of the mirror after two rounds of 24h cleaning.

Unfortunately, the stains were still there. They may have gotten a bit fainter, but not so much.
We decided to continue the cleaning over the weekend.

In the meantime, I tested the following procedure on the contaminated VP to clean the stains with FC.

1. I poured ultra-pure-water on the surface of the VP. Then I also sprayed isopropanol on the surface. This is to mimic the solution of Clarity lens cleaner.
2. Then I sprayed first contact on top of the wet surface.
3. I will dry it over the weekend and peel it on Monday.

The photos of the stains on the VP surface and the FC covered VP are attached.

If this procedure successfully remove the remaining stains, we will apply this to the sapphire mirror too.