You should leave the Xbox without turning it on for a few days and then wipe down all remaining residue with a microfibre cloth if you don’t wan to to open it up.
If you do open it up, then you should wipe the insides down with a microfibre cloth, reassemble it, and hope for the best.
If that does not work, try troubleshooting.
If THAT doesn’t work, then you might need a new console.