Just seeking some advice regarding cleaning my filters and lenses. I was just cleaning my UV filter, it is virtually brand new but just got a tad dirty from a day out, and I got it pretty clean but when I look closely there are some very small particles etc. now these are incredibly minute, I struggle to see them but nonetheless I do see them. So my question is: Should these be going or am I just being too 'perfect' and will not be able to get the to brand new state again? As no matter how delicate, soft and precise I was, they just seemed to stay. Thank you in advance.