Patent ID: 8083858

Claim:
Method for cleaning an artillery gun barrel, wherein the artillery gun barrel is cleaned of gun oil, greases, or combustion residues using a washing liquid and a brush element, comprising moving the brush element backwards and forwards with the aid of the washing liquid while circulating the washing liquid through the artillery gun barrel, the washing liquid containing ammonium oxalate and an oxidizing agent, cleaning out copper of the artillery gun barrel simultaneously with gun oil, greases, or combustion residues, the brush element having bristles and an external diameter of the brush element defined by the bristles is not more than 5% greater than an internal diameter of the artillery gun barrel, revealing a copper surface in the artillery gun barrel, from underneath a copper oxide layer, while removing a copper oxide layer that accumulates on the copper surface with the brush element, and bringing the revealed copper surface into contact with the washing liquid which dissolves the copper in the washing liquid.