WASHING (Heb. rāhats, kāvas, Gr. niptō, louō, loutron). Frequent bathing was necessary in the warm climate of the East. In Egypt, Syria, and Palestine people washed the dust from their feet when they entered a house (
International Standard Bible Encyclopedia (1915)
The "washing balls" of Susanna verse 17 (smegma, a very rare word) were of soap.