DHS - NBACC research report on the use of simple sunlight as a source of UV rays for rapidly destroying / disinfecting COVID-19 virus particles.
Also, temperatures over 95F in combination with 60% humidity, results in more rapid deactivation of the COVID virus.
1:24 diluted household bleach, and ordinary 70% isopropyl (rubbing) alcohol, are found to be very effective as disinfectants for COVID.
A simple cardboard box lined with aluminum foil, can be used to collect sunlight and evenly intensify natural UVB rays, for disinfecting outer surfaces of objects within minutes. Exposure to full intensity sun UV for 20 minutes should result in >99.9% complete disinfection of the outer surface. This provides a free and unlimited means of convenient and reliable disinfection, for example of food packaging or objects received as shipments. Some people are using UV for disinfection and re-use of scarce face masks.