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Personally, I've found using a cover can sometimes affect the heat - this appears to have caused slight marks (as if caused by smoke or scorching) in between some of the keys.

I'm not using the cover at the moment to test this and your right it does appear to be a bit warmer with the cover on. However the risk to my MB from my juice wielding toddler :eek: means I will continue with the cover most of the time.

The marks that form are dirt. A moist cotton bud will clean it off and if you don't mind then saliva is a very good cleaning agent (again on a cotton bud).
 
As many others have stated, the best way to prevent it is to simply remove the cause of the problem (and I do not mean dumping your girlfriend), simply keep all liquids away from it, don't use it with a cup of coffee next to it, don't keep it on the kitchen counter, just keep all liquids away from it.
 
The MacBook keyboard has lots of places for liquid to drop through and onto the logicboard underneath.

However these holes have another, more important function - they allow air to be drawn in by the fan and blown out the back of the machine.

If you make it spill-proof then you are going to restrict the amount of cold air that the machine can suck in and it will start to overheat.

Somebody fancy trying it ..............

I have a MacBook Pro Retina that replaced a MacBook Air that encountered a bowl of chicken soup (RIP).
A Moshi KeyGuard now protects this new machine and I've had absolutely no issues.
This same protector is used in Apple Stores for their order entry machines.
This would seem to refute the need for airflow via the keyboard.
 
Trying to liquid proof all her devices will solve the symptom but not the cause of the problem.
 
On rare occasions my computer is on the same table as a liquid, but I try to keep those times to a minimum or only use a thermos of some kind (Starbucks has some nice ones). After a couple of decades using computers, I've had no trouble.

Good luck liquid-proofing your devices. My guess is that it won't work out terribly well and the most reliable solution is to just move the $3 dollar cup of coffee away from your $1400 devices. It only takes a tiny bit to do terrible damage.
 
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My wife`s 13" MacBook Air was prematurely retired last year due to a glass of water and our youngest, while I was out of country on business, so she was forced to use an ancient HP for 3 weeks. Needless to say her new 15" rMBP has a significant exclusion zone for liquids, food, kids, dogs etc...

It`s a hard lesson, equally one you won't forget in a hurry :eek:

Q-6
 
My dads 2010 15" MBP encountered a full glass of Ice Tea, some two years ago. It went all over the keyboard, but missed most of the motherboard on the inside (didn't hit the fans, was turned off immediately). Computer is still in daily use to this day, but the keys are a bit sticky :D
 
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