On Sun, 02 Mar 2003 07:19:02 -0700, "Allen S. Lefohn" <asl@attglobal.net> wrote:

>I have a 77mm Hoya Skylight Filter and I have tried to clean the filter

>with no luck. I started out using the drop of liquid on the microfiber

>cleaning cloth. However, each time I think I have completed the job, I

>find smudge marks associated with the wiping. I was told by the camera

>store that people have complained about problems with cleaning the

>multicoated filters and they suggested dish soap. I tried that and it

>also left smudge marks. I have used my breath with the microfiber

>cleaning cloth and still no luck. Any suggestions?

I hate MC filters for this reason (and MC is also

unnecessary on a filter). Try dish-detergent again,

followed by a VERY thorough tap-water rinse. Follow

this with a thorough distilled-water rinse, and air-dry

with a strong air hand-syringe (this works to get most

of the stuff off, if silicone HAS NEVER been used on it

[try alcohol, if it has - but this requires a long,

miserable cleaning session to correct...]). Follow

with breathing UP onto the filter, cleaning local

areas with fresh Q-Tips (wash hands in dish-detergent

first, though...).