Sentence:  In the household market , there are also low-sudsing detergent formulations based on nonionic actives with about the same amount of phosphate builder ; light-duty synthetic detergents with much less builder ; and the <WSD>dwindling</WSD> built soap powders as well as soap flakes and granules , none of which are now nationally advertised . 
Meaning of the word marked with <WSD> tags:  gradually decreasing until little remains