Other Rusty crank

Location
michigan
I just disabled my DASA 1100 and I was shocked when I saw the crank.
It has only been a year and it looks like I have been using it as a boat anchor.
I always blow out my boat and never leave the hood on. I use maxima super M and run cam 2 110 .image.jpeg image.jpeg I don't know what is causing this, any thoughts?
 
Mine looked the same way it's not rust it's a film from
Maxima products I bet ur cases look the exact same way
It runs off with a rag doesn't it ?

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