Does it need it??
Put it aperture mode, set at a high f/stop and take a picture of the blue sky. Download it and look for blobs or spots of "stuff". You might have to to set the focus to manual and infinity to get it to lock on.
If there is dust, then you should clean it. If you don't want to do it yourself, check the local shops and see what they want for it. Then talk to DVCjen and let her talk you out of that approach!!