The real problem with the President's comments about using Ultraviolet light or a chemical to disinfect the virus inside your body, is that it's something that medical science has been working on for years. Many tests, experiments and studies. Here are a few examples:
Ultraviolet blood irradiation (UBI) was extensively used in the 1940s and 1950s to treat many diseases including septicemia, pneumonia, tuberculosis, arthritis, asthma and even poliomyelitis. The early studies were carried out by several physicians in USA and published in the American Journal of Surgery. However with the development of antibiotics, UBI use declined and it has now been called “the cure that time forgot”.
Here's one study at Cedar- Sinai study that is being completed. Peer-reviewed data to be published on this soon. The video shows how the light would be used:
Scientists at MIT have been experimenting with compounds that could be put inside your body to disinfect your lungs of the virus. You can read about it here: http://news.mit.edu/2020/peptide-drug-block-covid-19-cells-0327