How do you clean an expensive mechanical watch movement case without scratching the crystal?

Question

My luxury wristwatch has accumulated layers of sweat, dust, and wrist oils along the bezel seals. What cloth and brush steps clean it safely?

WatchMaker · Answer

Use a clean, dry, extra-soft bristle toothbrush to dislodge loose grime from the lugs and bezel paths. Wipe the crystal face using a dry optical microfiber cloth; never use chemical solvents on watch gaskets.

How do you clean an expensive mechanical watch movement case without scratching the crystal?

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