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IR touch screen only needs something to block invisible light beam not too narrow or wide and not damage screen. I have used 7mm plastic end of interdental brush, small cheap water color brush thaI cut off handle to make it 8cm long and a 12.5cm long lipstick brush that retracts to 10cm. They all work equally well. My favorite is always handy fingertip with only downside leaving finger prints on screen.
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