Just got done using Zaino Spray Cleaner and Leather in a Bottle on my stone colored seats. Nice stuff! Time to do the furniture in the house now.

 

Optimum Power Clean diluted 3:1 also works wonders, and can be used for a whole ton of other things. Its actually on the xmas list I gave to my wife!!!

 

I don't think I'd want to use something that's good for cleaning wheels on any part of my interior, much less the seats, diluted or not.

 

PowerClean is actually meant to be a paint-safe cleaner. Its quite gentle when diluted down to 3:1.

Its very different than a regular citrus APC.

That said, on my new G Ive only used Leatherique, because I had a chance to start from scratch so the seats were never dirty enough to warrant a really powerful cleaner. Leatherique is a little on the expensive side but the results are excellent, even on brand new already-clean seats.