If I could make an unsolicited recommendation: Change to red for the rough side and white for smooth. The white, without a doubt, is a finer compound and it just seems logical to me that you would do your final stropping on the smooth side with the finest grit.
From the verbage on the packaging I think the red I have is finer than the white. I will check it out when I get home. If you are correct I will switch.
As far as cleaning a strop at $2.00 for all the scraps I got from Tandy I am not sure if I will clean them. I might just toss them and buy some more scrap and start fresh.