I went on vacation for a night and when I got home and unpacked my stuff i realized that my hair oil/sheen had opened onto my makeup brushes in my toiletry bag and totally SOAKED into them! they're very expensive and I don't want to have to buy new ones, but nothing I try to clean them with gets this stuff out! i've used soap, vinegar, and hot water and they're still the same. i know it shouldn'tve been in there with them but i just wasn't thinking!! do you have any ideas as to how i can clean them??