1.Use the milk method. Pour milk right on the part that is itching with the fiberglass. 2.Try cortisone cream. Rub on some cortisone cream.This comes under various names such as Cortaid. You might need a script for it, depending on where you live. 3.Take a cold shower and use cheap hair conditioner to rub on your skin.In rinsing off of the conditioner, you will remove up to 98% of the fiberglass..Try cortisone cream. Rub on some cortisone cream. This comes under various names such as Cortaid. You might need a script for it, depending on where you live. 3.Take a cold shower and use cheap hair conditioner to rub on your skin. In rinsing off of the conditioner, you will remove up to 98% of the fiberglass.