Over-sudsing problems occur for several reasons. Soft water requires less detergent than hard water. This product, SofChek, will help you to determine if you have soft or hard water in a minute or less. If you pre-treat your clothes, you will need less detergent to get them clean. Many times the pre-treatment can add to sudsing in the washer. If you use an oxygenated bleach, this can contribute to over-sudsing. Adjust detergent levels accordingly for hard or soft water, load size, water temperature, and amounts and types of soils on the clothing.
If you want to get rid of the excessive suds, advance the timer to the final spin cycle, and then re-wash the clothing without adding detergent to it. Repeat as necessary until the wash and rinse water is clear.