Today I revived my car's heated oxygen sensor. Took it out last night and soaked it overnight in Apple Cider Vinegar. In the morning at around 10, I took a tooth brush and rubbed all the carbon off of it through its holes and then blasted it with a pressurized can of NASA carb cleaner. Then I let it dry off in bright sunlight for a good half hour before re-installing in my car. Now the car seems to have MUCH MORE power than before and is very much responsive. A LOT of carbon came off from my O2 sensor because of perhaps the previous episode of leaking fuel injectors causing the engine to run rich all the time. I just recently ended up replacing all 4 fuel injectors, coils and spark plugs.
I've read a lot of success stories of O2 sensor revival with vinegar and mine seems to be a success as well.
P.S., Just make sure that you cannot revive a heated oxygen sensor with this method whose heater is not working. This could only work IF your sensor is lethargic/fouled and the heater element inside is intact.