Yep,nylon bottle brush and teapot spout brush from the local pound shop work well for me. And a toothbrush on the nipples.
I dont like WD40 though,particularly on the cylinder. Its good for penetrating around the trigger and hammer but I find it affects caps more than oil. I always "cap off" before shooting but you can get "damp squids" after WD40. It seems to penetrate the cap quicker than you can let it off but plain oil does not.
“If a cricketer, for instance, suddenly decided to go into a school and batter a lot of people to death with a cricket bat, which he could do very easily, I mean, are you going to ban cricket bats?” :- Prince Philip said after Dunblane