Knight ultralight cleaning

[jfujan]

Having trouble getting all the residue off of the 90 degree flat surface where the breech plug and barrel meet. Shooting triple 7. Everything cleans up great with 91% Isopropyll alcohol besides this last bit. Tried spinning a wire brush on it and doubling up on patches with no luck. What's the best way to clean this? Thanks!

 

[toytruck]

I use several patches on a bore brush in that area and breech. Then q tips dipped in citrus cleaner till clear, for T7 or Hoppes or Butches bore shine for BH 209.