If by 'gunk' you mean carbon, almost anything works better than Sweet's - Kroil, KG-1, Slip 2000, some even use CLR (Calcium, Lime, and Rust remover).Was afraid of that. Haha, you'd figure for such an expensive rifle it wouldn't have issues like this. Appreciate it.
Any suggestions on getting the gunk off? Been using sweets 762 and a wooden pick but some of that stuff is stubborn as hell.