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The scope is 'sealed' but it's not an airtight seal so moisture will get in any time you use it. If it's dried moisture you're seeing then it's possibly best to leave it alone but if it might be the start of mould then it needs attention. If it's on the rear element nearest the focuser you could remove the lens (don't ask me how to do this!) but if it's between the elements the whole lens assembly would need to be taken apart, which is much more complicated and usually requires expert knowledge to get it back together and collimated.
Good luck. Hopefully others will chime on with more useful information.
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