Vinyl & Leather Scrub Brush
heres a 50/50 of one of my leather seats, apc + this brush, and a water rinse worked pretty well for it, it actually softenened the seat a little where it was harder, but that may just be from not being completely dry, but it worked good for me.
and before and after of the whole seat. still looks good, but i may go over it one more time and see if i can get more to come up, my drying rag was pretty dirty after
and after
sorry for odd color, it was nighttime in my garage, and the flash of my camera was the best light offered.