Final answer:
The product attributes that should be promoted for the Sauber washer-dryer combo are cleaning power and convenience.
Step-by-step explanation:
The product attributes that would be most beneficial to promote for the Sauber washer-dryer combo are cleaning power and convenience. These two attributes address the key concerns of consumers when it comes to laundry appliances.
By highlighting the cleaning power of the Sauber washer-dryer, you can attract customers who prioritize having clean and fresh laundry. This can be achieved by emphasizing the effectiveness of the surfactants in the detergent used in the washer-dryer, which are responsible for the cleaning performance.
Additionally, promoting the convenience of the Sauber washer-dryer will appeal to customers who value ease of use. You can emphasize features such as programmable settings, user-friendly controls, and quick cycle times to showcase the convenience and efficiency of the appliance.