MBPr Maintence Issues

Q-tip and rubbing alcohol.

It will collect less dust than you think. I recently opened my non-unibody MBP after over 4 years of intensive use and travel. There was barely any dust inside. Unless you routinely work in a dust storm, you don't need to worry about it.

How to clean Apple products

Apple also gives instructions on how to clean your Mac in the User Guides for the MBA, MBP and iMac:

Also, you'll find plenty of suggestions by searching through the many existing threads on this topic, such as these:

Good screen cleaning liquid/ kit
How Do You Keep Your rMBP Display Clean
How to clean MBP?
Keeping your Air clean?
Clean your MacBook Pro
Alcohol % for cleaning?
I need to clean my iMac's screen.
Mba cleaning
Using a damp paper towel to clean the exterior: Bad?​

 

Not at all. You can use water, if you prefer. Just make the Q-tip moist. Don't let liquid get inside your Mac.

 

Ask as many questions as you like. No, don't drip anything inside the plug. You can moisten a Q-tip, then press it on a cloth to get rid of excess liquid. If the Q-tip is too big, carefully use a dull knife with a damp cloth wrapped over it.

 

A sharpened pencil eraser might be good on the power connecter area tooand a dab of compressed air. 91% rubbing alcohol better than 70% btw.
Be sparing with the liquid, no drops direct just use a qtip & even wring it out to a point. I also like GGJ's idea. Here I was about to caution you to be non-anal about this & listen to me. You should see how well I clean handguns

 

After that first dent, u'd forget the whole thing and have more time to do other things.