Eish Flutters
You can try Q20, but make sure the lens is facing down the whole time and then when it's off, clean very well and carefully.
When you get it off, do yourself a favour and keep it off for good! Rather keep your lens cap on and take it off when in use. Those filters do more harm than good to photographs. You have a lens that is optically correct and costs a few $$$, only to lower the quality of the lens by placing a cheap piece of glass in front of it. Your photos will look better without using a filter.
