I did one of those "I should know better" things the other week. I bought a wool Margiela cardigan at the good used clothing store, took it home, and realized it was perfumed just enough to be unwearable.
I may have mentioned that I'm very sensitive to most fragrances (headaches and upset stomach). Well, unsurprisingly, a lot of used items have a strong perfume scent. I don't always notice in the store, surrounded by competing scents, but it hits once I'm home. I can't count how many times I've tried to wear a thrifted item and changed my outfit within minutes. Even when I think I can just ignore it... no. And this is after I've washed it, or even dry cleaned. It doesn't help.
I was sad about my lovely Margiela sweater so I hit the internet looking for a solution. Everywhere I searched seemed to recommend the same product: Atsko Sport Wash. It's marketed for hunters who need to be scentless to avoid deer noticing them though as far as I can tell they also sell the exact same product as Sensi Clean laundry detergent and a few other re-labelings.
So I bought some off Amazon and it was miraculous. I wore the Margiela sweater today and I can't smell even the tiniest whiff of perfume.
They claim it's safe for wool and silk and all sorts of delicates, though I'm a little nervous, given how strong it seems to be. But I did a whole load of delicates with this stuff instead of my usual detergent and everything smells so much cleaner now. My delicate-wash silks were building up a bit of human odor from overly-gentle washing.
The funniest thing is that I also washed a heavily perfumed Madewell top I got for a few dollars... and now that the perfume is gone, I can tell that the wool is completely permeated with sweat smell. Ew. No wonder it was perfumed! I suppose that's why humans started using the stuff to begin with...
Speaking of consignment stores, I sold a stack of nice things I don't wear anymore and got $275 for them! Good laundering helped there, too -- they'd passed on buying a white Everlane shirt that was just a bit yellowed. I threw it in the wash with my other whites and some Oxyclean until it was shining white, and they bought it on the second try.