Apple

So I bought this (used) MacBook Air M1 (2020) a few days ago (the MacBook itself is just 10 months old) . When i opened the parcel and used the MacBook for the first time I immediately noticed, that the spacebar is a little bit sticky. I tried to clean it with a brush, just a little bit but it wont really help. Today I wanted to use it again but it even got worse. I still have 2 Months warranty but if IceTea or whatever got spilled on the keyboard apple wont fix it for me unless i pay for it ( so no warranty will apply i guess). I don't know what to do - they guy I bought it from swears he didn't spill anything. Does anybody know if its possible to just clean the spacebar and not replace the whole damn keyboard? Is it possible that a guy will do it for me? I read a lot of posts and watched a bunch of videos regarding cleaning the spacebar and I have to admit it doesn't look that easy.I really hope somebody can help me.

Video of the sticky key -it might take some time to load....