Here's some "cleaning" directions from current S&W Owners Manual regarding Titanum cylinders.

http://snwcdnprod.azureedge.net/site...6560000_WC.pdf

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 revolver’s 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 cylinder’s 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 it’s protective surface layer and greatly reduce the cylinder’s service life because of excessive erosion that will take place while firing and will void your revolver’s warranty.

Per TARROWMAN's post above, it's best to tread lightly.

FWIW,

Paul