Blackpony

We opted to use Porsche leather products for our newer Porsches. The lighter colors, i.e. Garnet Red, Luxor/Havanna Beige, Dark Blue interiors show discoloration/dirt from road grime with top/windows down and soil from seat belts. The seats clean up perfectly with the cleaner and the "conditioner" makes wipe down easier. After market leather cleaners tend to discolor/darken the leathers.
For our older vehicles, Lexol has kept the leather intact since the 1960's, preserving a 1939, Mercedes-Benz 320 Cabriolet A interior. Old leather will dry out and separate or shrink. Conditioning helps seats survive for 300,000 miles.
The best UV protection is a sunshade, tinted glass and a cockpit cover.