Spiders in servie panel

I’m used to seeing bugs/spiders in panels, but yesterday, this amazed me.

But I noticed a lot of oxidation on the conductors inside - just curious if this would be caused by the spider/cobwebs, or if something else would be responsible? Never seen this before… Thanks!

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There are a lot of things that can cause that oxidation, (especially spider urine :grin: ) but it needs repair or replacement.