Are you in your 40's and she is 23?

you had to???

And chopping shoshoba!

wewe swale mdoe wacha siasa mingi.. does it really matter where it was ironed as long as its clean and not smelling like sukuma wiki..

Come clean boss shida sio hiyo ya ku iron kwa kitchen.... Fungua roho usaidiwe na resident psychologists hapa wazua..

You did good. I hope you highlighted the problem in soft, polite manner. Next time it happens, criticize her in funny, sarcastic way, this works for women. Like "Hey, yahwa, yaani that worktop is for everything? Can I 'iron' you right now on top there".

To discourage this from becoming a habit, bring up the issue later today.
- Tell her you'd like to say something about the issue in this morning.
- Tell her you think if you both iron clothes at the right places, then you'll be role models to everyone in the house in doing the right thing.
- Tell her: just imagine the house girl ironing your best clothes in the kitchen and stains them in the process?
- Then take her hand, without smiling, and tell her that you're proud of her in many ways and that you're sure she'll hear you out and understand that you were not happy about it.

Then, do not argue further, be be normal and do not bring it up again.

This way, you become 'park-leader' in your home and your wife will appreciate it someday.