The only thing fragile are the main primary mirror and the smaller secondary mirror anything else can be cleaned with Windex and or Pledge.
To learn how to clean the mirrors read this:
http://www.astro-tom.com/tips_and_advice/cleaning_optics.htm#article1
The mirror should be VERY dirty or leave it alone.
You must do this gently or you will scratch the mirror. Once the mirror is clean you will need to re-collimate the scope. Watch this video:
http://www.andysshotglass.com/Collimating.html:
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