Moths are the critical pest for the felt in the piano. Here too, unplayed pianos are more at risk. Moths are often brought in with old carpets or items of clothing. Or even with the piano. The easiest place to find traces of moths (pupation remains) is on the hammers of the action. If traces of moths can be found in one place, they were probably also in other places in the piano.
It is not uncommon to find moth sachets or lavender sachets in old pianos. These lose their effect after a while and should be regularly replaced with lavender or similar commercially available preventative agents.
A piano infested with moths can only be restored by a piano maker. As a rule, all felts must be replaced.
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