I've taken the plunge and invested in a Lee filter system with hood et al. I've been wondering about cleaning the inevitable fingerprints off the corners of th e filters. I know that you can buy a special resin filter cleaner liquid, but wa s wondering if it isn't exactly the same stuff that I can buy (a lot cheaper) fr om my local optician who sells it to clean plastic/resin eyeglass lenses.

I know I shouldn't cheap out when it comes to protecting my investment, but are there any thoughts on what to use to clean resin filters?