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After last years hurricane I had two downed trees in my yard. I bought a 20V DeWalt 12" chainsaw. I had other tools compatible with the batteries.

It was just big and powerful enough to get the job done. One of the trees had white milky sap.

I thought that I had cleaned the tool well enough but this week when I tried to use it the chain was gummed up and frozen. On the blade chain guide every spot there was a link was a small spot of rust.

what can I use to clean this and get it functional again? The chain pivots on its links when I took it off.
Should I soak it? Any advice appreciated.