I lost my lens pen a couple weeks back. Around lunch time I saw a small smudge on my 18-200vr. I took a microfiber towel I have and gently wiped it off. Next thing I know there are several dozen little lines on the lens that don't want to blow away with my little hurricane blower . I started getting pissed cause I thought that there was something on my microfiber towel that I didn't see. I figured the 18-200 wasn't really something I should over, and it's not like I fucked up a $1,500 glass I ran out to a local camera shop (PJ Camera) and picked up a lens pen. I wiped down my 50f1.8 since it was dirty and felt like cleaning the 18-200 for shits and giggles. They were all just little fibers that were left on the lens . It's still scratch free. Now I just need to get me a UV lens so this won't happen again.