Restoring shine to a Yamaha

[R Barber]

I talked to the manager of our local authorized Yamaha dealer- he says 
Yamahas have been polyester since the late sixties.  Use no ammonia 
products.

This info is from http://ptg.org/resources-pianoOwners-finishCare.php

     * Polishing -- Satin polyester looks best when simply kept clean. 
Avoid gloss-producing polishes, which leave satin finishes looking shiny 
but scratched. High-polish polyester finishes need only be kept clean to 
maintain their gloss. However, high-wear areas such as the music desk 
may eventually develop a hazy appearance caused by many fine scratches. 
These areas can be buffed back to a high gloss using a product designed 
to remove tiny scratches from fiberglass boats or plastic windows in 
convertible cars. Two such products are Meguiar's Mirror Glaze #17 
Plastic Cleaner, and Meguiar's s Mirror Glaze #9 Swirl 
Remover--available from marine supply, auto-parts, or automotive paint 
supply stores. Your technician may carry special products for this 
purpose, or can recommend a local source.



> Someone may have used a solvent based cleaner destroying the finish 
> coat?  If the lacquer is still good you might try a wax.
> I have no experience with Cory products- I use mother's spray detailer 
> and an ultra soft microfiber cloth for lacquer and keytops.  Lets see 
> what Yamaha has to say...
> 
>> Hi all.  I recently removed about a ¼ inch of dust from a church’s Yamaha
>> grand.  There were lots of fingerprints on the fallboard so I proceeded to
>> put on some Cory polish that specifically states it removes fingerprints.
>> (By the way, this is a lacquer finish.) Well, it immediately clouded up, I
>> tried buffing it off, it looked terrible, I applied some Cory wood cleaner
>> which made the wood look very dull.  I talked to the Cory people who said it
>> was probably reacting with a previously applied oil-based polish and I
>> should apply a little Windex to remove the oil.  When I applied the Windex
>> nothing happened.  The fall board basically looks like someone removed the
>> shine.