Based on the research, and referring to the Supplementary appendix at:
their testing showed undetectable levels of virus titre when the virus was exposed to 37C for 24 hours. Please note that the temperature testing was done using a virus transport medium and not a mask.
There was still virus titre present on a mask outer layer after 7 days.
I wonder what ironing the mask would do.......
I looked at that - maybe I missed it - what were the test conditions for the mask?