The 1970 LAPD recruit training class on the Introduction to cleaning of the S&W .38 revolver, 101, stressed the following:
1. Remove the cylinder and yoke from the revolver. (Return the yoke retention screw to the frame to prevent its loss.)
2. In a small jar, soak the cylinder and yoke overnight in Hoppe's #9.
3. Coat the inside of the barrel, frame and outside of the barrel throat with hope's #9 and let set overnight.
4. Mash a bronze, 12 gauge shotgun bore brush in a vise for use in cleaning the face of the cylinder, barrel throat and recesses of the frame. (Granted there are many other brushes available on the market but this particular brush provided a greater concentration of bristles on the work surface than anything available at that time.)(Removal of the cylinder and yoke facilitate a secure hold of the cylinder, and reduce the chance of damaging the blueing on other parts of the gun during cleaning of the cylinder face.)
5. Insert the yoke into the cylinder before using the bronze brush on the cylinder face, to prevent broken bristles from getting inside the cylinder where they would prevent the cylinder from turning freely and would be difficult to remove.)
6. Use the bronze brush to clean burnt powder and lead deposits from the cylinder face, barrel throat and recesses of the frame. (Over time this method is guaranteed to remove the bluing from the face of the cylinder and any other area it is employed.)(The loss of blueing was acceptable, residual lead deposits were not.)
7. Never attempt to use a drill motor to turn a bore brush for cleaning the cylinder chambers.