Any recommendations for an interior detail in South Bucks

[omniflow]

BMW 5 Series with Silverstone II leather interior - it's a bit dirty (possibly even faded in places). Want it brought back to new. Tried doing it myself with Swissvax leather cleaner forte, and I'm either not doing it right, or it's harder work than I'm prepared for. Quite happy to drop the car off, or have someone come to me.