Here’s a new tip for a category of cleaning we’ve not known before. Cloth masks are helping slow the spread of Covid-19, and after using may collect virus particles. Just throw preshrunk and washable masks in the washing machine with other outdoor clothes, launder in hot water and dry on high heat. Another option is to seal used masks in a plastic bag and wait a week for possible viral contamination to die. Keep your cleaned masks isolated to keep them uncontaminated.