I ordered a B+W 6 stop ND from Amazon (shipped from Amazon) a couple weeks ago. I opened it a few days ago to discover that the filter looks like it has little speckles all over the front of it. I tried cleaning it with lens cleaner but it won't come off. If I look through the filter from the back you can't see them and it doesn't appear to show up on the images. Only when looking at the front of it can you see them. Is this the "coating" on the filter? Both my B+W 10 stop and circular polarizer are clean from the front and back.
Pic of the box is attached. Tried to take a pic of the speckles but it's hard to see them on a cellphone pic.