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I made a stylus! I needed something fast to use this weekend when folks sign transactions on my phone. I used a sponge as the tip which will wear out over time so you will have to replace it. Though I was hoping to find some anti-static foam in our house but I couldn’t. Seems like that as a tip would last longer.

This one discusses the foam sponge. 
> As to my sponge, it’s just a generic brand and I didn’t wet it and I never washed it. I stuck it in an old exacto blade barrel because I had it.