I had a similar horrible sqealing on the drive belt of the MB, my indy has used the spray suggested before but hasn't found it to be of much use over time.
He fitted a new one which was just as bad within a week, fitted another new one and that is still silent some 6 months later, he can't fathom it either.
Think you'll have to find a proper indy Medskipper, quite where i don't know but you could start by consulting the good garages guide above.
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It's no more than 30 minutes to change the belt on an early MX-5. I did mine earlier this year after failing with the normal bodges of water and wd40 (which at least showed which belt was making the noise). Change both while you're at it, but get the right ones depending on power steering yes/no and A/C yes/no.
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...If it helps suggests watering it and says that it works - I would think that drying the pulleys might help....
The moisture causes the fibres present in most belts to shrink.
Dousing the pulley and belt in lots of water will cause it to slip.
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