How can remove a bad smell from use the cow urine for making a good ayurvedic medicine?

Just soak the herbs used for the medicinal preparation in cow urine for seven days, changing the urine everyday after discarding the previous day's urine by decantation. then the herbs are triturated with the bhavana dravyas (juices of different appropriate herbs). these preparations are usually made into pills and dried in shade. Ther will be not telltale smell of urine.