Need Help Cleaning an Old Shotgun

[Spellnj3]

Hey guys,
I have an old Steven's 410 shotgun that my Dad had when he was a kid, now my son is using it but I want to give it a deep clean.  The barrel is a dark color and theres a lot of dirt build up around the trigger and some other parts.
What is the best way to restore this gun to a new look?
Thanks

[stone road turkey calls]

I suggest you take it to a pro to restore it, i took my grandfathers 12g stevens and had it redone i was very pleased. about $125.00