Zymol etc. I really like the 'Carbon' product and the 'Vinyl' product. Other Zymol products haven't done it for me. I also use Griot's machine polish 2 and 3, and SpeedShine (great stuff). For leather care I use a cocktail on a terry cloth: 100% mink oil and BMW Leather Lotion... Over the years these have been the best performers for me.