This paper presents an approach to investigate the correlation between the long-term variability of photometric zero-point curves and the quality of the primary mirror coatings in 4-m class telescopes, specifically focusing on Blanco (Cerro Tololo, Chile) and SOAR (Cerro Pachón, Chile), both NOIRLab facilities. Using imaging data acquired with DECam (Blanco) and Goodman High-Throughout Spectrograph (SOAR), we are constructing an extensive dataset comprising observational data taken at similar instrumental conditions, sampling a substantially long period of the telescopes' operations. The analysis involves a comprehensive comparison of the photometric zero-point light curves against the reflectivity curve of the primary mirror of each telescope, taken after each cleaning cycle. This study aims to aid in optimizing maintenance efforts, including scheduling cleaning procedures and re-aluminizing tasks, thereby enhancing the operational efficiency and longevity of the telescopes.
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