Not the same, but I used Tri-Sodium Phosphate (TSP) on my black seatbelts. They were dingy, and discolored, and stiff. I was planning to clean them, and then redye them, but after a couple of rounds of TSP, they were soft and flexible, and back to the original black, so I didn't redye them.
I'd be cautious of any product containing bleach, if the top is sewn with cotton thread. I'd worry about weakening the thread. Not sure, but I think Westleys contains chlorine, too.
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