CDNS (content delivery networks) are usually not directly involved in cleaning against CC attacks (DDoS attacks). The primary goal of a CDN is to improve the performance and usability of a website by distributing content, not as a dedicated DDoS protection service. However, some CDN providers may include some basic security features in their services to help mitigate the impact of DDoS attacks on websites.

Cleaning CC attacks usually requires dedicated DDoS protection services that use a variety of technologies to detect and filter malicious traffic and ensure that legitimate traffic reaches the target server. These technologies may include:

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1. Traffic analysis: Analyzes traffic patterns to identify abnormal access behaviors, such as a large number of requests from the same IP address.

2. Behavior analysis: Detect user behavior patterns and identify abnormal user request patterns, such as abnormal click rates and browsing patterns.

3.IP blacklist: Blocks traffic from known malicious IP addresses.

4. Rule-based filtering: Filters out abnormal traffic based on predefined rules.

5. Man-machine verification: The introduction of man-machine verification mechanism to ensure that visitors are real users and not automated attack tools.

6. Distributed architecture: Use a distributed architecture to distribute traffic and prevent attacks from being concentrated in one location resulting in overload.

7.DNS defense: Protects against attacks at the DNS layer to ensure the availability of the DNS service.

It is important to note that while CDNS themselves are generally not professional DDoS protection services, some CDN providers may offer solutions that integrate with DDoS protection services or partner with a professional DDoS protection service provider to provide more comprehensive security protection to their customers. When choosing a CDN service provider, you may want to understand its security features and consider additional DDoS protection services if needed.