I'm afraid to count them, but based on having something like 15 to 20 strops .... like any normal person ... both vintage and current. I've never even put neatsfoot on a leather strop. Never washed one with saddle soap or shaving soap. I rub them with the palm of my hand every so often and all but one of them work fine.

I do have one dubl duck I got off of the bay that needs some TLC and that is the one I planned to try the shaving soap and bottle on. It won't make the old thing any worse so I can't lose one way or the other and some day I may actually try it but if your strop is working don't fix it. Just IMHO