The product-in-crate washing machine allows many different lots of products, large or small, to be washed soon after one another and in their own crate. The unique system offers the possibility to bring clean whole heads of lettuce on the market with minimal water consumption. The system offers a fully automatic concept for drying the whole heads after washing. It is not only suitable for whole heads of lettuce, but also for vegetables and herbs. System capacity is 500 crates per hour.