Ha... I thought you broke it. Then you'd be up s||t creek. Don't worry if it's only smudges. A soft rag with bit of soapy(dish washing drop) warm water will clean it. It does have a small curve and it is a lens with a profile so don't rub it with a hard material in a concentric manner or it is possible to bugger it. Just wipe it radially from the inside out. If you keep it clean it'll be easier to keep it dew free as well.
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