hi,
can anyone give me suggestions on how to clean grey leather? what products should i use since most products are geared for the tan leather.

 

Not sure where you heard this, but it's not true. All of the leather cleaners I know of have no color preference when it comes to their ability to clean. Besides, with todays' automotive leathers you're really cleaning what's ON the leather (polyurethane clear topcoat) and not the leather itself.

Might I suggest the following in no special order;

Woolite and water mix. Recommended by many oem manufacturers such as Cadillac. You can dilute 6:1 (6 parts water to 1 part Woolite) or slightly less depending on severity of dirt.

Leatherique Pristine Clean. Very good stuff. http://leatherique.org/detail.aspx?ID=6

Lexol cleaner, available at most auto parts retailers.

This thread here offers many other choices with feedback on each one;

https://www.clublexus.com/forums/automotive-care-and-detailing/60556-cleaning-and-conditioning-leather-seats.html

Best of luck!