Cleaning dies ???

[Deleted member 118572]

only on outside.

 

[Philward]

Bought some 257 Bob RCBS dies on Ebay.
The crosshatched part...

For future reference it's called knurling,

 

[muledeer01]

I've wet tumbled brass jags, bore mops, bore brushes, various black powder supplies, never had a problem, everything came out like new but I don't know about a reloading die.

 

[crystalgayleguy]

Personally, I'd try a bit of PB Blaster (good ol' panther pee) or some other penetrating oil first. You don't need a lot. Let it it soak into the rust for 15 to 30 minutes and then hit it with a worn out bronze bore brush or a mild wire brush. Why risk the pins marking up the inside of the die for what is really just a cosmetic defect (assuming the rust is only on the outside knurling).

I put in a ultrasound