bencelest

From my observation and my own use of cast iron iron when I was a teenager, the purpose of banana leaves is to make the iron slippery so when you iron your clothes it is much smoother and easy to iron your clothes so you can finish faster.
You can experiment even now even with your electric iron, try ironing your T-shirt first without pressing the iron to a stack of banana leaves, then do the same, iron your T-shirt after pressing your iron to a stack of banana leaves. You will feel the difference how so easy it is to push the iron to the cloth.
I tell you it beats the spray that you use today.

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Banana Nut