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For flexible scopes, brushes must be cleaned and disinfected at the end of the work shift to ensure that they are free from contaminants before the next use. This action is crucial because flexible scopes are highly susceptible to contamination due to their complex structures and the procedures they are involved in. Regular cleaning and disinfection help to prevent the transmission of infections and maintain a high standard of hygiene.

Cleaning and disinfecting brushes only after every use or when visibly dirty would not consistently mitigate the risk of cross-contamination, especially considering that some pathogens can survive even in the absence of visible soil or debris. Consequently, adhering to a protocol of cleaning and disinfecting at the end of the work shift provides a reliable safeguard, ensuring that the brushes are always ready for safe use when needed.