Just got done attempting to clean my driver's seat, so I'll report my results. Because 409 had been known to bleach the seats and Simple Green said to not use on leather, I tried Bon Ami.
First of all, this stuff does clean the leather. It comes in a can just like Comet and is a powder substance just like Comet. It is, however, very abrasive. I probably used more than I should, but I sprinkled it on the seat, sprayed it with water, and used a soft fingernail brush to scrub. While the dirt did come out, I noticed some brownish beige coming off on the cloth. The seat lost the "sheen" or "shine" it had and developed a rough texture. I went over it again with Lexol cleaner and LOTS of Lexol conditioner, which improved the texture. I may try mink oil to get it to shine back up.
Be careful with this stuff. I did later dilute it in the spray bottle with water, but didn't clean much with it like that.
I would try to use something else. Though it does clean, it does strip the seats down. I don't think I really ruined mine. Putting lots of conditioner helped restore some of what was taken out of it. BTW mine also has that "jean-like" texture on parts of the driver seat. I think it's a combination of years of wear, heat, with alot of butt-in-seat time that caused the chemicals in the leather to melt.
Anyway, thought I'd share. Sorry..no before/after photos. I quit scrubbing so hard after a few minutes as I didn't want to ruin my seat. I'll try something else.