To scent your bath water, add the last bit of your perfume, even if it is dried up and cannot be worn anymore. You can even float the empty bottle in the bath water!
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If you have a scent that's too strong for you when you apply it, you can dilute it in your bath water.
For a spa experience, add epsom salts (you can half with bath salts to make them last).
Samples of body wash can be used as bubble bath.
To rid your hair of buildup, add a few tablespoons of baking soda to your first application of shampoo.
Remember most shampoo can be diluted in half, and is still effective.