I'm not sure how well it'll show up in the pictures, but my chimney cap came un-siliconed and allowed some rainwater to run down the chimney along the liner and drip onto the top of my 3-month old Jotul F45. I think at least some of the rustiness is from water running over the metal damper and dripping on to the stove, I'm not sure if the stove itself could have rusted just from water dripping on it since it's painted. I was able to get the majority off with mild detergent and a toothbrush/rag, but there's still some orange left if you can see it in the pictures. It's not that noticable since my stove is fully inside the fireplace, but I'd appreciate any suggestions to make it better.
I did fix the chimney cap, by the way.
I did fix the chimney cap, by the way.