There are going to be dust on the lens all the time.
I clean the front element with a lens brush first and then lens cleaner like Kodak and lens paper tissue ONCE A YEAR. There are synthetic fiber fabric for this also, but it sets you back more than you want to spend. Check your camera store for a lens cleaning kit. I stay away from compressed air also which might actually blow the dust inside the barrel.
Sledge hammer is perfect for cleaning your frigging G90 lenses! Whats up with all the G90's popping all of a sudden? On the serious side. I wear glasses so I went to Lens Crafters and purchased a cleaning solution and lens cloths that are safe for COATED lenses. Works fine for me.
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