Cleaning procedures from the Smith & Wesson manual:

CAUTION:
REVOLVERS WITH TITANIUM ALLOY CYLINDERS

Titanium alloy cylinders weigh approximately 60% of what a similarly sized stainless steel cylinder weighs and yet is able to withstand the same operating pressures. Care and cleaning of the revolverʼs titanium alloy cylinder consists of normal gun cleaning procedures using high quality gun oil and cleaning solvents when necessary. However, under NO circumstances should the cylinderʼs chambers (charge holes) or front face be cleaned with an abrasive material such as sand paper, Scotch Brite™, Crocus Cloth, etc. To do so will disrupt itʼs protective surface layer and greatly reduce the cylinderʼs service life because of excessive erosion that will take place while firing and will void your revolverʼs warranty.