EGR valve

I have a toyota camry 2000 mileage120000, and my check engine light is on. So I got it checked. They say it was the egr valve. So I took it home and cleaned it. But my engine light does not turn off. Does that mean I have to replace the whole egr valve? Or mayb I didnt clean it well? How do you clean the egr valve? And where should it be cleaned at? Could it be that my sensor is haywire? Also I what else can I do? Im tryin not spend alot but just enough to pass smog. That is the reason I cannot pass smog. :|