When Hilda arrives at Sally's dance party, she's suddenly struck with a severe case of the sneezes. Thinking she's come down with a cold, her friends take her to Doctor Lion who informs her she has an allergy to something. It turns out she's allergic to her best friend Sally - or rather, the new rose-scented perfume Sally's wearing. First Ella's washing disappears right off her clothesline, then Mr Frumble's BBQ, then Miss Honey's deck chair, all in a blink of an eye! Our heroes work their way to solving the mystery by determining that it was none other than Mr Fix-It and his Super Duper Silent Street Cleaner that's been sucking everything up along with the trash.