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good evening, this morning I accidentally cleaned the wood of my piano (natural walnut color) with a spray cleaner for glass that as the label says contains ammonia, I know that this is not the best solution for cleaning wood because it is corrosive, can I rest easy since it is the only time I have made a mistake? Also I usually clean the piano with a spray cleaner specifically for wood is it the best solution to clean it?

I would be highly suprised if anything happens to the wood, especially if this is a one off.

Some spray cleaners designed for wood are harmful to piano finishes. It's usually recommended to just use a dry or very slightly dampened with water cloth followed by another cloth to dry the finish. There are other cleaners especially made to be safe for pianos that other posters may be able to name. The type of cleaner, if any, one can use I think also depends on whether the finish is satin or gloss.

https://www.ptg.org/ptgmain/piano/care/basic-rules

What kind of finish? Is it polyester (most modern pianos) or an older finish? Yes, some chemicals can damage the finish, even with one application. I guess the question is, how does it look now?

If it's a high gloss polyester finish it should be fine. Many dealers use Windex (which contains ammonia) to clean all their poly pianos. If lacquer though you should have followed it up with a damp cloth to neutralize it.

BTW, polyester us impervious to chemical paint strippers so it should tolerate a little ammonia like it was sugar.

Peter Grey Piano Doctor

the piano is not made of polyester but of natural walnut, but I think that a single application of a spray glass cleaner with ammonia cannot happen, right?... usually being in natural walnut I use wood cleaner that nourishes and contains beeswax, excellent for wood, can it be ok?

The question is not what wood it is made of, but what the finish is.

Finishes are not nourished. They are dead. So is the wood. Maybe the ammonia will clean off the beeswax and anything elst that your "wood cleaner" may have left on it. That would be a good thing.