I remove grips.
Put the gun and cylinder (separated) in hot soapy water. Scrub scrub scrub, brush barrel out. Rinse with hot water. Dry as much as possible with rag/towel. Spray wd 40 into the inner works around hammer, trigger, bolt head opening, hand slot, and even down barrel and through the cylinder chambers/nipples. That romoves all water. Dry again with towel, shake out any wd 40 that I can. Push a dry patch through the barrel (usually only one is needed). Do same for cylinder chambers. Let set for about a half hour, then spray some remoil into the guts and all around except in the barrel. Rub with a rag to remove excess oil. Run a slightly oiled patch through the barrel and cylinder chambers. Done.