I take off the seal and spray the bearing out with motor spray. I get my bearing oil and oil it 2 drops ( I say thinner the better because I get around to bearing maintenance often). Wipe the seal so there is no dirt and put it together. The high pressure of the motor spray helps clean out everything very well. Just make sure you do it in both directions so you don't miss anything. The oil is enough, but not enough forever. I clean my bearings every one or two races. The thicker the oil you use, the less you have to clean and reoil the bearings.
Also, with fiber sealed bearings, the first time I tried to remove the seal, I removed it like a rubber bearing seal and ripped it up. Remove the circlip with a exacto knife.
Also, I don't suggest the use of Isopropyl alcohol as it contains an amount of water. I use denatured alcohol or stuff like nitro wash or motor spray.