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Almost a week ago I spilled a full cup of coffee on my Macbook Pro 2018 with Touch Bar. Coffee is spilled mostly left-ish side and it was without sugar but some milk. For now nothing major happened and it is working almost good but clicking on left side of trackpad doesn't working. I can move cursor, tap to click is working but no click sound on left side. And one USB-C port on the left is problematic. It's working mostly but when I move the cable or device on that port the connection loses briefly and returns back. Keyboard is working totally normal and there is no other issues for now. 6 months of warranty left but I don't even now if the spill already voids my warranty. So now I am in between opening the case and clean inside of it or wait till my warranty end.

What do you recommend for me and if I you think that I need to open and clean inside what can I use to clean water, coffee, fat etc. ? I have all the tools for opening the case and I am experienced with it.

Thanks for any help.

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"Recently"… unless it was in the last 5 minutes, you likely missed your chance.
The absolute first thing to do is stop using it, disconnect the power, including the battery, strip it down & start to dry up as much as possible.

Don't hope it will be OK.
Don't put it in rice & expect it will just get better.
Don't plug it back in to see if it still works.

Your two main enemies are short-circuit & corrosion.

Any liquid containing a high percentage of water will immediately short-circuit anything it touches, potentially causing component damage or even fire.

Any non-pure liquid will then start to corrode the delicate circuitry, quite rapidly in the presence of electricity.

The faster you can get the power removed & the circuits cleaned using isopropyl alcohol, the better the chance your machine will survive.

For additional reading -
No sound (speakers/jack) + microphone's dead after spilling water
&
What procedure should be followed post spilling fluids onto a MacBook keyboard?

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    Follow this advice. Don’t use the generic 70% stuff either, you need the 90% (or better) isopropyl alcohol. – Allan May 30 '20 at 20:03
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At first, you should check your warranty status here. Then, as a person who spilled an energy drink on my own MacBook-Pro (but actually newer with another type of the keyboard), I advise to clean and dry the surface without opening inside. Do NOT use a hairdryer or any stuff like that. Only towels etc. And GO to the service center (official ofc) to let them check your MacBook status). Unfortunately, it will cost you some money but MacBook's design is quite complicated and wasting even a minute would lead to even bigger problems (-> more money to repair it)

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    A water-spill is not a warranty repair. It's an insurance claim. support.apple.com/HT201880 – Tetsujin May 30 '20 at 15:13
  • @Tetsujin I posted that link for gkon because it seems he doesn't know about it and it's helpful to check your warranty status anyway. And also I actually got full keyborad replaced after spilling water on it for free without any additional insurances etc. I paid only for checking its condition. Maybe that's because it happened in a week after purchasing it but that's the fact. It's worth trying :) – Mark Tiukov May 30 '20 at 15:20
  • Actually it was nearly a week ago and I am using it since then. It was an important point so I edited my question. I just dried it from outside for minutes. But no luck for powering off because while I cleaning it kept powering on continuously. Maybe it was because of the trackpad. – gkon May 30 '20 at 16:12

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