How do I clean my telescope, The mirrors? How often do you have to clean them?

[blackhole1027]

I looked in it today & I seen 2 lil peices of dirt, grass or something because I went out early this morning about 3 and stayed out till the day light. Also how do I keep dew from getting on the mirror? I have the Orion SkyQuest XT10 Classic. Will dew mess the mirror up? Will cleaning it mess it up? One more thing does anyone know when Jupiter will rise in the evening? I would rather look from sunset to midnight than look at 4 in the morning. What does the andromeda galaxy look like in a 10inch? There is the link for my telescope. Is that a good scope or do you think I wasted my money?

http://www.telescope.com/control/product/~category_id=dobsonians/~pcategory=telescopes/~product_id=09708