Ooo the responsibility that comes with being a mod!
Yeah I've had a gentle scrub with the leather brush I bought from Polished Bliss but I still think they could be better. Definitely better than they were but I want to get them as good as I can before applying the Gyeon Leather Coat I've bought.
I have a lot of respect for Larry Kosilla at Ammo NYC and watch his videos on a regular basis but his more aggressive leather cleaning techniques look just that, a bit aggressive! Still he is an experienced pro and maybe gentle use of a scrub pad is what I need!
https://youtu.be/R0EOb2nEWtk
I know, the power eh.
I agree, I think the older more supple, worn-in leather can take, and needs a more aggressive approach. I can see that giving the surface a scrub would lift the 'nap' so to speak and eliminate some of the shine. Not sure you'll ever get rid of it completely though as that is part of how leather ages.
If you've got a good video to work off, that's great (not had chance to watch it yet but will), and I'm sure he knows what the leather can take. Just be extra careful if you've got any areas that look close to splitting. On my Mk6 there was an area on the seam of the (door) side bolster of the driver's seat that I thought I'd caught with a buckle or something. On much closer inspection I realised it had just split in 3 little lines with age. So avoid being aggressive around the seans and where the stitching is.
Let us know how you get on.