one of those (reasons) many of us bring packages into the house- open them in the laundry room & put the fabrics right into the wash- before it goes anywhere near the sewing room we wash & dry it- then take our new, freshly laundered soft wonderful new fabric into our sewing space to iron it & either use it or fold it to put away. you never know what you will bring into your home that comes from a stranger's home. since you've already cut the fabric & don't want to wash it now- you will need to struggle through the smell & wash the finished quilt. i'm surprised you did not notice it when you opened the packages- i can usually tell as soon as i open the packages- even if the fabric is in plastic bags.