Put banana in blender and puree until completely smooth. (Whatever you do make sure you puree it the first time I skipped this part and I had clumps of banana in my hair which sucked, so make sure you get the banana mixture completely smooth you really don't want clumps of banana in your hair.
The great thing about this recipe is that even if you do mess up and get clumps in your hair it's just banana and a second rinse or mash will get it out.
Then add mayo and oil and blend until smooth and creamy. Apply to hair. Let sit for 15-30 minutes. Rinse with warm water and shampoo as usual.
This Banana Hair mask will make your hair so moist and smooth you'll think you suddenly have a completely new head of hair. It's a must-try.