Need help! German helmet, Restoring or just cleaning it?

Hello everybody. So i just recently acquired this helmet, an M40 i believe, with a part of the liner and washers for a good price. You can barley see the decal on it, and some painting is still visible. And so my question is: Should i restore it, or just clean it? If so, how should i do it? Any advice would be nice:) Thanks. Photos attached.
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