It is better to offer related products verbally. Of course, this does not always work, because there are visitors who do not want to listen to such consultations. There is also the possibility that a person simply does not have enough money to purchase several items at once. However, in other cases, this strategy will work, and it can already bring additional profit to the store. In this case, it is important that the seller does not insist on buying this or that product. The optimal option - succinctly talk about the benefits of using the main product together with this or that related product.
For example, you can say that the washing machine will last longer when using sulfate-free powders, and immediately offer several options in different price categories.