обмылок
Муж.; разг. remnant of a cake of soap, remaining piece of a bar of soap; мн. washing, soap-suds м. разг. remnant of a cake of soap.
Полный русско-английский словарьМуж.; разг. remnant of a cake of soap, remaining piece of a bar of soap; мн. washing, soap-suds м. разг. remnant of a cake of soap.
Полный русско-английский словарь