Belt dressing is not the solution !
You surely use the wrong belt.The V shape of the belt is too small or became
too small by the squealing and hits the bottom of the pulley even when fully
With a new (bigger) belt it will never squeal.
Have you checked your alternator/water pump belt? The power steering belt
is driven by the water pump. If the water pump/alternator belt is loose
and you put a load on the steering pump, the alternator/water pump belt is
likely to slip and squeal.
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