Hire a professional HVAC cleaner for this. Alo you can go for Annual maintenance contracts for air conditioning systems(عقود صيانة سنوية لانظمة التكيف). It can....
https://techplanet.today/post/a-complete-guide-about-chiller-air-conditioner-maintenance-syan-mkyfat-tshlr

In an air-conditioning system, many components are used to produce chilled or hot air. Among the many components chiller plays the role of transferring heat....
https://posta2z.com/post/63413_regular-chiller-maintenance-will-keep-your-ac-system-healthy-and-long-living-chi.html#google_vignette