For those who don’t already know, a virus requires a living host to sustain itself. It cannot survive on its own as it does not have the internal architecture to replicate itself. Viral matter (with regard to 'known' viruses) can live for hours, not days, so if you leave your mask off over-night, any viral matter that might be there will not survive. By spraying with sanitiser, you are eliminating the potential for transference.

Cleaning your mask after use is a hygiene practice that applies to any 'personal ' item or garment worn or used. Bacterial and viral matter can be present in or on the mask and may be transferred by handling .It would be a sensible precaution to spray the mask, outer and inner, with sanitiser. 

The Respro® Sanitiser is an ideal product not just for your mask but for everyday use and an essential part of your everyday travel kit.