We always use Sun and Earth brand laundry detergent. You can read more about that here: http://tinyurl.com/aorazsu. The detergent is made with citrus products, so it sometimes retains a light citrus smell, but not a perfume.
That said, we do share washing machines with other customers who may use perfumes in their laundry. On rare occasions, their detergent gets stuck in the machines and makes it into one of our customers' loads. If you're smelling artificial perfumes in your laundry, this is probably what happened. If you'd like, we'd be happy to re-wash any items that you'd like.