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Mine isn't squeaking. Yours is because your pulleys aren't aligned or because you are using an improper belt.
Belt dressing if the belt is in good condition. Make sure that it is not a pulley squeaking and if the belt is in bad shape replace it.
the most likely cause would be an improperly tensioned serpentine belt
it´s possible that a bad hydraulic lifter is working dry.
don't know about belt; but the noise might be water pump or AC compressor (if installed). Mine has same. hi there mate I'm a Toyota tech. you need a need belt and tensioner its hydrolic therefore not adjustable.
Spray hairspray on the belt if it is making the noise or replace the belt or the pulley if its making the noise.
The belt is slipping.
Most likely the power steering belt is old and should be replaced.
If it's a "chirping" noise, then you don't have the belt tight enough.
Sometimes squeaky noises can be a result of a damaged belt. When you speed up, the noise goes away. You should get your car inspected by a mechanic.
Alternator belt in need of Tightening is One Squeaking Noise.
Most likely a worn serpentine belt. Replacing the belt with a new one should correct the noise. If not the belt, it could be the idler pulley, which is not putting enough tension on the above belt, causing it to slip and thus squeal.