u/ameyyyyy

Hey guys I bought this guitar about 3 months ago I recently started to notice that a smudge started to appear on the edge of the guitar now I don't know what this is, this looks like it to me I tried wiping it off using water. However, then it didn't come off so I mixed soap water after consulting with Claude but it's still not coming off so what is it actually? It has started to bother me because I just bought this a while ago so this shouldn't have happened.