Astanga Hrudaya
सुखोष्णोदकगण्डूषैर्जायते वक्त्रलाघवम्। निवाते सातपे स्विन्नमृदितस्कन्धकन्धरः॥१०॥
Holding comfortable warm water brings about ightness and cleansing of the mouth. Gandusha Vidhi – procedure - The person should sit in a place devoid of breeze (Nivata) but in sunlight (Sa Aatapa).
english translation
sukhoSNodakagaNDUSairjAyate vaktralAghavam। nivAte sAtape svinnamRditaskandhakandharaH॥10॥
hk transliteration by Sanscript