Here's my sad story..... I bought a bolt of fabric for a really good price 2 years ago, and it was upright between 2 cabinets, on the floor. I finally decided what to make with it, and it required cutting numerous 3 1/2 inch strips. Now keep in mind I'm not a pre-washer. I started cutting strips, and then ironing the crease out. I started noticing an odor, could not figure out where it was coming from. Turns out, the little runt (weighs 6 lbs) had lifted his leg on the end of the bolt-- the fabric is mottled, so it was not noticed even with some scrutiny. I really did not want to wash the whole bolt, so now I'm cutting, and hand washing those strips that were affected as I go.
I can tell you now, that there is nothing quite like the smell of warm ironed dog pee......and he's my daughter's dog!
Jackson in my scrap basket, made a nest