So my brother recently bought a Canon M50 mark ii and I don't remember how, but I accidentally touched the viewfinder with my finger/thumb as he found a fingerprint smudge on viewfinder the next day. He tried to clean it with his kit, but he said, now it cannot be cleaned and that smudge has caused some kind of "discolouration" and now his viewfinder will not give accurate colours. He said now it will need professional cleaning or even replacement! and it will cost a lot as they would need to dissemble the whole camera and this will not be covered by warranty! I don't know anything about cameras and it was the first time I held an expensive one. I feel bad because he blames me for not knowing how to handle cameras, but I also think it is dumb of the company to keep such a delicate part vulnerable to touch and will not give any kind of protection. If you know about cameras, please tell me if I really messed up his expensive camera or can this be fixed without spending a lot of money.