Drain cleaner with ingredients of lye aka sodium hydroxide without aluminum chips. To clean or disenfectHousehold items... the kind your partner probably thinks shouldn't be multi-purposed... so which of them have you, or do you still, use to support your reefing addiction (I mean hobby) without telling them? Whether you've permanently liberated these items or just borrow them and put them back, when no one is looking. Of course I’m not talking about why we all go through 3 times as many paper towels as any other household. More substantial stuff. Stuff we “borrow” cuz it just makes sense.
I’ll go first. Measuring cups, dishes, turkey baster (before I bought my own), knives, forks, spoons, shot glasses, bamboo shish-kabob skewers, tea towels, glitter nail polish (to label my “mix” and “drain” pails, of course), bath towels (had a little mishap using a shop vac in my sump... definitely did not tell her about that), spray bottle (for vinegar and water... “honey, have you seen that spray bottle I was going to use?”), some space in the back of our wine fridge. That feels like a short list. I’m sure there’s more that I just can’t think of, or haven't gotten around to yet.
What about you? I bet there's some pretty novel ideas. Nobody will tell. It’ll be our secret.