Beyond Balaji Patil, what other devotees are mentioned for performing humble, yet significant, acts of service for Sai Baba?

While Balaji Patil Nevasakar's service of sweeping Baba's paths was profound, Chapter 35 notes that others also performed this heartfelt service. Specifically, it mentions Radhakrishnabai, who is described as having great skill in this work. Despite being a Brahmin who was worthy of worship, she was never bothered by the thought that sweeping was a menial task. She would wake early and clean Baba's paths with a broom in her own hand. Chapter 35 also briefly states that after some time, another devotee named Abdul 'moved forward' in performing this same service, showing that such humble acts of devotion were practiced by several of Baba's followers.