Man that's a real bummer, sorry to hear it messed up your client's photos. Using oil on shutter curtains is such a classic piece of bad advice that keeps getting passed around. For the FM2, a tiny bit of lighter fluid on a q-tip worked for me once, but you gotta be super careful. Maybe try that on a test roll first next time.

That's a really sweet story, but I have to ask about the logistics. Doesn't the texture of the focaccia change a lot after being frozen and thawed? It seems like it would get soggy. Maybe she has a special way to warm it up that keeps it good. What's her secret for making it still taste like home after a trip from the freezer?

Yeah @grantk61, reminds me of the time I tried to paint over wallpaper glue. Looked fine for a day then peeled off in sheets. Had to scrape the whole wall and start over.