When researching wood finishes, I often see that varnish is attributed with the ability to "protect" wood. In what way does varnish protect wood? From scratching? From fading? From moisture? From ...
I have recently inherited a 100 year old piano that has not had any love in a long time. I have tried to clean it with vinegar and water but it persists in being VERY sticky. I don't want to harm it ...