Sentence:  They 'd peddled the <WSD>soap</WSD> virtually alone , and without much success , until about a year ago , when - with the addition of `` SX-21 '' to their secret formula and the inauguration of a high-powered advertising campaign - sales had soared practically into orbit . 
Meaning of the word marked with <WSD> tags:  a cleansing agent made from the salts of vegetable or animal fats