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For cleaning optics, I use 10cm square swabs made from clean old cotton t-shirts. They are virtually lint free and very absorbent. Use them once then throw away. You can age a new t'shirt by running it through the washing machine a few times using hot water and detergent. That will remove any "polish" from the fibres.
I've been using this method for years now and have never damaged my optics. I use isopropyl alcohol purchased from Jaycar.
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