In the case of this one I assume you have a cold or something that makes you NEED to blow your nose during the week and also that you DO indeed use the sandpaper rather than just doing nothing.
I'll assume this is EVERY time they have a cold.
Where should this comment appear?
This pairing only
Whenever "Blow you nose with sandpaper for a week" appears
Whenever "When your spouse has a cold they don't blow their ..." appears