Currently, there are no medicines or remedies that have proven to prevent or cure COVID-19.
Several people have claimed that heat kills the virus, and have also recommended drinking hot water, taking hot baths or use hairdryers to prevent or cure the virus. But, there's no scientific evidence that any of the things mentioned above will prevent or cure COVID-19.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.