I use leather cleaner and leather conditioner from Chemicalguys.com. Used it on my M4 also. Very satisfied with the results. I also always use a windshield screen when I park my car outside at the golf course, etc. I know it doesn't change the interior temp much, but it does protect the dash from direct sunlight. Had to change the dash in my 1977 280Z in the distant past, never want to do that again!
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