How often should I use a clay mask to achieve optimal skin rejuvenation? Is it advisable to incorporate such treatments into my routine on a weekly basis, or should I exercise caution and limit their application? Could factors such as my skin type, the specific formulation of the clay mask, and environmental conditions influence the frequency with which I apply this skincare staple? For instance, if I possess oily skin prone to breakouts, would utilizing a clay mask twice a week yield notable improvements in my complexion? Conversely, might someone with sensitive skin benefit from a more restrained approach, perhaps limiting use to bi-weekly applications? Additionally, how do external elements like pollution and humidity affect the necessity of using a clay mask? Exploring these variables is essential for determining the most suitable cadence for my skincare regimen and ensuring that I derive maximum efficacy from the clay mask experience.