Hello all, I am not a knitter but the daughter of a very talented knitter who has made me lots of lovely sweaters over the years. I was doing some deep cleaning and discovered something is making my sweaters disintegrate. Some of my sweaters have holes and something sandy all over them. It only seems to impact some sweaters. Some sweaters that were stored next to each other are not affected. I separated the infected and have cleaned the shelf they are stored on. Any advice to further clean and ensure this doesn’t happen any more would be great. I live in Colorado and the local yarn shop said we do not have moths here, so I think it’s something different.

Attached is a picture of what the holes look like.