Woah hold the car wash. It may not be the actual petal or even the mechanism. I found that when ever if put my clutch in it would make a squeaking noise. Turned out to be my seat. Try ratcheting the seat up a few pumps with the long lever on the side and see if the squeak goes away. For whatever reason the drivers seat squeaks on my car if it's all the way down low as it goes. If you have power seats try just raising it and inch or two.