strop, "GOJO" and neatsfoot oil
I have been a leather craftsman for 30 years, so I am NO expert on leather. My horsehide strop from Tony Miller had turned grey from daily stropping. While mentioning this to John Crowley, he mentioned the handsoap "GOJO" helped clean his strop. I tried "GOJO" handsoap with a wet rag, rubbed it in the leather, let it dry and rubbed pure neatsfoot oil in the strop. Once the leather dried I used my hand to rub the leather smooth. Try it you'll like it. Saddlesoap also works, here in west Texas cowboys use saddlesoap to clean the saddles and leather accessories. Juan.