You might try one of these:http://www.micromark.com/MicroLux-Mini-Sandblast-Gun-Set#?promocode=17WS015&leadsource=email&utm_source=Marketing&utm_medium=Email&utm_campaign=17WS015I have one and it will work. Etches/cleans steel nicely. They are also available at your local hobby store.Fred
For the life of me, I cant figure why one would do that. Switch to an acrylic striker and throw the sand paper away. Problem solved. All you need is a little scotch brite, and very lightly at that.
who carries the acrylic strikers