http://www.schneideroptics.com/info/faq/bw.htm#qu17 17. What is the best way to clean my B+W filter? ------------------------------------------------------- The first step is to use a camel hair blower brush to remove any loose dirt, grit, etc. from the glass. Then use a cotton swab, Kimwipe, or WHITE KLEENEX brand (no additives) moistened with a name brand lens cleaning solution or original Wi..