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Yes, I think you will need to wash your mirrors a bit more often to slow the oxidisation process. I did hear a story from locals about a big Obsession scope near the beach here that was used without a shroud and the secondary didn't last all that long. But you may also have to accept that you will be looking at realuminising more frequently than some. But I've also used badly oxidised mirrors before and sometimes you can't tell what state they are in. Depends how picky you are.
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