Hello Logie
If you can dry out the moisture, chances are it should not effect the view at all even if you can see dried watermarks.
If you have to dismantle it for cleaning then this guide may help.
http://www.cloudynights.com/documents/cleaning2.pdf
I have also read some good information in a book I found in the library.
It is by M Barlow Pepin and published by Springer. It is called Care and use of Telescopes I think.