Use the DOVO 515 leather balm to rejuvenate your leather strop. First, apply the balm to the leather, and then rub it in with a cotton cloth and polish it smoothly. Then strop the edge of your straight razor on the smooth surface to keep it sharply honed. The leather balm also prevents your strop from drying out and extends its service life.
Well worth having in your saving kit if you have strops of any kind.