I have had a clothes moth problem ever since I inherited my mother's piano back in the '90s. I had no knowledge of pianos and no idea that clothes moths go for all the felts. After about 10 years I conceded that realistically I was never going to learn to play the thing, so I called in a local dealer who had been recommended to me. When he opened it up I could see that it was full of larva cases and most of the felts were either down to a third of their original size or non-existent altogether
.
It was only then that the penny dropped as to how our house had become infested with the dratted things - the fellow said that judging by the extent of the damage to the piano, it had had a moth problem for at least 20 years.
I've tried, and failed, to get rid of them. so the suggestions on here so far will be tried - thanks suzied (I'll try the steam cleaner trick, but the sticky strips were up for months and didn't catch a single moth
) and J52 (I'll look out for that spray)