My grandfather suffering from covid.in chest x-ray lungs are almost white as per Dr. it's full of phelgum highly infected. Oxygen level fluctuating 95 to 75 using oxygen concentrator at home. Not having fever and he is feeling normal even in 75 oxygen not feeling any suffocation. medicines:taking medrol, rixant,doxy dox lb, paracetamol,rcut and nebulizer. Are these medicines enough to clear lungs or congestion or if is there any fast treatment available to clear lungs please suggest. Age is around 72.