I went through an EU consumer law claim. I documented the process here: https://charlieegan3.com/posts/2019-11-02-refunding-another-.... I understand this is largely unchanged after Brexit.

I'd like to know that as well. My 2016 MacBook Pro is one of the worst laptops that I've ever owned and I had to have that stupid keyboard fixed 3 times during its lifespan.

The macbook keybord keys can be cleaned, you just have to remove the keys properly (I had a macbook 12).

https://www.youtube.com/watch?v=N4rI4-q4uYQ

But you will have to do it every month if you don't use a cover.

I'd really like to know the answer to this too. Mine needs a replacement keyboard but I haven't been able to be without it for that long (!) and worry both about the cost and time requirement.