Answer:
Step-by-step explanation:
I would calmly talk to my staff by reminding them on the importance of sanitizing all our work tools and also reemphasize on how careful and mindful they need to be as regards for fruther mistakes from them won't be tolerated and if such repeat itself, i'll have whoever is responsible queried.
My friend is also a customer and her query would be handled in a professional manner. I will be polite in my response by firstly appreciating her for reaching out with her concerns and as well apologize on behalf of my staff that failed to do the needful. I will then assure her that such wont happen again.