The keys of the piano are moldy.

The keys of the piano are moldy, because the wet weather makes the keys rusty and moldy.

Solution of moldy key

Open the lid of the 1 piano box, wipe the moldy place with a dry rag, and put the piano in a ventilated and bright place for a period of time every day. It is best to put the piano in a ventilated place indoors at ordinary times.

Put some desiccant camphor, but be careful not to put it for too long. And don't use alcohol, use furniture to protect the wax! In addition, control the humidity, not too wet.