My mom, who is an avid bargain hunter, recently bought a large quantity of yarn from a thrift store. There were some great finds in there, and I was very pleased! However, I am concerned about things like bacteria, lice, and bedbugs. Are there any suggestions on how to sterilize the yarn without damaging it. Some of the yarns are acrylics, some are wools, and some are blends; it's hard to tell with some because only half have labels still with them. Any suggestions and tips will be greatly appreciated!!!