Cleaning was tricky when I first started but I have it sorted now

I pump them with Fairy liquid and a lambswool mop, wash it out, dry with kitchen towel on a stick, blast through with compressed air, squirt in the Ambersil and put them away to next time.

Filthy flint locks get rinsed and brushed, compressed air to get them 100% dry then Ambersil. I swear by it.

Barrels that always pull rust have rust pits, I soak overnight in organic acid to remove all trace of rust, dry well the soak in Ambersil while it can still get right to the bottom of the empty pits. Sorted, no more rust.