Don’t Spray Anything on Your MacBook
Avoid the temptation to use a spray bottle on your screen or keyboard — even if it just contains water. That liquid can seep into your MacBook, damaging the internal components.
This is true even if your MacBook is powered off. Technically speaking, a MacBook is never truly “off” unless you open it up and disconnect the battery. There’s always power circulating inside, so don’t be lulled into a false sense of security because you’ve powered down your machine.
Instead, moisten (don’t saturate) a lint-free cloth under some warm water, and then wipe down your MacBook with the damp cloth. Distilled water is even better if you have it, but ordinary tap water is usually fine; just make sure it’s not too hot.