Some COVID long-haulers are turning to a controversial method to treat their lasting symptoms. Blood washing is a technique where a person’s blood is drawn, filtered for the purpose of removing toxins, and then injected back into his or her body. Theoretically, scientists say, it makes sense. Blood washing may have the potential to remove dangerous circulating micro clots and other damaging cells that could be contributing to long-haul symptoms. But what does the evidence say? In this week's episode, I turned to Dr. Sachin Mehta, medical director of neuro rehabilitation at Franciscan Health, for some answers.