Who here details with Sunglasses as a tool used during detailing....
I leather conditioned our 3 daily drivers....leather dashboards, I tend to go a bit -more-.
When applying or final wipe down,, it looked fine.
However....I just so happened to have sunglasses on the following day....and noticed small residue in the stitching seam where 2 pieces meet...so it's not just a flat stick but there is a slight material conturing the seam stitch.......I did a A/B test. Lifted sunglasses up , cannot spot any residue in the seam. Shades back on, can see a small amount of byproduct in there. 1s time I've ever noticed it due to having shades on