Shining Shoes

Use inside of a banana skin to polish shoes and give an amazing shine.
Feed Your Plants

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Bury banana leaves in the ground around bushes and large plants and they will provide a slow release of potassium and phosphorous to encourage healthy growth.
Mosquito Bite

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Rub bites with the inside of the skin of a banana to stop the itching.
Ease Red Ant Bites

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Rub skin on red ant bites and it will ease the stinging.
Sooth Grazed Knees and Elbows

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The oil in a banana skin will soothe the skin and promote faster healing.
Keep Bugs Away From Plants

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Place cut up banana skins around the bottom of plants to discourage aphids, etc from attacking plants, or laying eggs on them.
Fuel Your Car

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An Australian company is working on the idea of using bananas to fuel vehicles. You can read more about this here
Clean And Shine Houseplants

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Use the soft inside of a banana skin to dust and polish houseplants.
Smoking

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Banana leaves can be dried and smoked, although this practise is not recommended on health grounds. The dried skins are said to release a drug which is supposed to be psycho-active. There is some controversy over the validity of this but bananas do without doubt contain the antidepressant drug tryptophan.
Cure Warts

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Rub warts with the inside of a banana skin and the potassium in it will cure the wart.
Face Pack

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Mix half a banana with an egg and a little almond oil to make a face pack that will leave your skin wonderfully hydrated and smooth.
Whiten Teeth

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Rub teeth gently with banana skin (used the inside surface) dipped in a little salt . It makes a difference after just a few days. Don't use the salt everyday (use about every third day) or you will run the risk of damaging tooth enamel.