YA or kids’ book, fantasy or magical realism. Protagonist is a young girl. She gets sent to the store to buy something with a wick — either an air freshener or a candle? The one she buys is the last on the shelf, it’s in a dented can, and it smells like something you wouldn’t want air freshener to smell like. I think it’s either cabbages or broccoli. It’s also magical, and either gives her access to a magical world or brings her a friend/companion from a magical world. That’s all in the book’s set-up, like in the first chapter. No idea what happens from there.