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I posted the following in a similar thread...
“I have followed this thread since before I got my M2C.
There were no marks on the gauges when I took delivery.
Several weeks later, while detailing my car, I noticed dried droplets of some kind on the gauges.
Very carefully, I used a brand new, soft microfiber cloth (damp with water only) to very gently wipe the foreign substance off the gauge surface.
I held my breath and used no pressure from my hand.
Just the weight of the microfiber cloth brushed the gauge surface clean.
I then used another brand new dry microfiber cloth to gently touch the gauge surface dry.
Luckily, no damage was done.
Whew.
I hope I don’t have to do it again.”
I used brand new microfiber cloths with no washing detergent residue, in case this was an issue.
I very lightly brushed the gauge surfaces with the cloth.
It worked, with no scratches. Your mileage may vary.
Also, I wonder if the gauge supplier changed the gauge surface coating at some point.
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