There’s nothing worse that having that amazing bird fly “right there” into view and you realize that you just can’t see it that clearly because of the dust, raindrops and oils that have built up on your eye pieces or lenses. Keeping your binoculars clean is pretty straightforward but there are a few tips to doing to correctly.
First, you’ll want to remove any debris or dust. The best way to do this is with a blower or fine brush (like those used 
for camera lenses).
Next, clean the lenses using a soft, lint-free cloth or lens pen. Lens cloths are specially designed with micro fibers which are gentle on lens surfaces. They also don’t leave lint and won’t scratch the glass like a t-shirt or kleenex would. If there are spots or oils on the glass, you can also use special lens cleaning solution like that used for high end camera lenses (but check your binocular manual for guidance on this).
Some definite don’ts for maintaining your binoculars ….never use your breath to moisten the dust before cleaning. It could leave spots or damage the special coating on your lens surfaces. Never use your shirt to clean your optics. No matter how clean and soft your shirt may seem, it will have small particles of dirt on it as well as rough fibers which can leave small scratches that over time will make your lenses appear foggy.
When you’re out in the field and it starts to drizzle, try to keep your binoculars covered. This will help keep those spots off the lenses.
Now then, I better go clean those dirty binos that I showed here in the picture…..