Xbox has gunk in holes, how can I clear it?

Hello, I'm actually sorry if this can be a silly query, however I’m unfamiliar with xbox's in each manner…

My boyfriend has left for the army awhile in the past, and he requested me to ship his xbox to him since his household saved placing it off… I made a decision to scrub it a little bit earlier than I shipped it since his brother had been utilizing it and it was disgusting trying. I used to be cleansing it earlier than I seen there was gunk within the holes on the facet, I actually don't wish to harm his xbox by attempting to scrub that, however I additionally don't wish to ship it to him like that. What ought to I do? Thanks upfront. 😓

https://preview.redd.it/egqrqdw2k44c1.png?width=820&format=png&auto=webp&s=d39c7b12bf6e948278a735508cdaadd024c3e831