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I have a late 2013 MBPr 13", there isn't a single mark on it.

I use a keyboard cover for light use, like writing, but take it off if I'm doing anything that makes the fans kick in, such as rendering video. I take it off when I close the computer.

I clean the screen with a soft dry cloth (I get these from my optician, I have 5 pairs of glasses to maintain as well), and wipe the outside and the trackpad areA with a slightly damp cloth.

I run it on battery at least once a week, repair permissions before doing Time Machine and Carbon Copy Cloner backups, and turn it off at least once a week.

And carry it in a soft lined shoulder bag.

At a desk, i use external keyboard and trackpad, but mostly don't use it at a desk.

That's it, looks perfect, and no problems so far.
 
It's a thing I still do coming from a 2008 Macbook. Truth be told It's more of an habit which happens to help (or at least it looks like it helps). Currently rocking around 96% health after roughly 350+ cycles so it doesn't harm it either.
It is not good for a lithium ion battery to be fully drained, which is part of the calibration process. By calibrating, you are putting needless cycles on your battery, shortening the life your battery could have, and with no benefit, since calibration cannot improve or maintain battery health. Keep doing it if you want, but it's definitely a bad idea for anyone wanting to get the most out of their battery.
 
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Over the years I have had multiple unibodies and always treated them the same. Never ate in front of them, never set them down on anything or near anything that could get it scratched, clean the screen with a micro fiber cloth, and occasionally wipe down the machine down with a damp cloth and dry with a microfiber. Every year when Apple replaced it because of multiple repairs due to a plethora of issues, I always got a compliment of how well I had kept it. The machines were usually always scratch and wear mark free.

The current MBP I am using now (in my sig) was bought used for a pretty good deal on eBay. It has a dent on the lid that I covered with a city scape and some scratches on the bottom, along with some edge damage but it's not major. I just needed a laptop that functioned. I hope that within the next year/year and a half I can scrape enough money together to buy a refurbished 13" Retina.
 
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