**Explanation:**

The cleanest city in India in 2020, as per the Swachh Survekshan Report, is Indore. Let's understand why Indore was declared the cleanest city and explore some key factors that contributed to its success.

**1. Swachh Survekshan Report:**
The Swachh Survekshan Report is an annual survey conducted by the Ministry of Housing and Urban Affairs, Government of India. It assesses the cleanliness and sanitation levels of cities across the country. The survey takes into account various parameters such as waste management, open defecation, solid waste processing, etc.

**2. Indore's Achievements:**
Indore has consistently performed well in the Swachh Survekshan Reports. It topped the cleanliness rankings in 2017, 2018, and 2019 as well. This demonstrates the city's commitment to maintaining cleanliness and improving sanitation infrastructure.

**3. Solid Waste Management:**
Indore has implemented effective solid waste management practices. It has a well-established waste collection and segregation system, ensuring that waste is properly disposed of and processed. The city has also adopted innovative techniques like door-to-door waste collection and the use of GPS-enabled waste collection vehicles.

**4. Open Defecation Free (ODF) Status:**
Indore has achieved the Open Defecation Free (ODF) status, which means that the city has successfully eliminated open defecation by providing adequate toilet facilities to its residents. This significant achievement has contributed to improving overall cleanliness and hygiene levels in the city.

**5. Public Participation and Awareness:**
Indore has actively involved its citizens in maintaining cleanliness and promoting awareness about sanitation. The city has initiated campaigns and programs to educate and engage the public, encouraging them to actively participate in keeping their surroundings clean.

**6. Smart City Initiatives:**
Indore is a part of the Smart City Mission, which focuses on transforming cities into sustainable and citizen-friendly urban centers. The city has utilized technology and digital solutions to enhance waste management and sanitation services, further contributing to its cleanliness.

**Conclusion:**
Indore's consistent efforts in solid waste management, achieving ODF status, promoting public participation, and embracing smart city initiatives have played a crucial role in being declared the cleanest city in India by the Swachh Survekshan Report in 2020. The city serves as an inspiration for other cities to prioritize cleanliness and work towards achieving a healthier and more sustainable environment.