Crystals and stones can be cleaned in various ways, but here I am going to leave you the one that I have been using for 20 years and it has always worked well for me.
Clean and Charge
* Full Moon Night
Prepare your bracelet in a safe place, where the light of the full moon falls on it.
As you visualize your stone/crystal as moonlight, full of power and purified energy... Ask the Moon Goddess to cleanse, purify and consecrate your stone or crystal and remove all negativity from it that she may have absorbed
Once you have done this step, leave it overnight to charge.
**If you notice that your stone needs an urgent cleaning and you cannot wait for the full moon, you can smoke it with incense and pass it through the light of a candle.
The first time you are going to clean and charge your bracelet, I recommend that you program it.
It is convenient to dedicate your crystal or stone, to the purpose for which you want to use it, since this helps to focus the energy and direct it.
Programming
Take a moment, where nobody bothers you.
Take a few deep breaths, relax your mind and take your stone or crystal in your hands... visualize how a white light surrounds your bracelet... feel that light, coming from the Goddess, from the Universe, from the Source... See how full of power and positive and loving energy, your bracelet.
Say out loud:
Thank you, thank you, thank you "
Then leave your bracelet in a safe place where the moonlight falls on it and leave it overnight.
The next day, before the first rays of the sun come out, pick up your bracelet, it will be ready to wear.
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It is possible that depending on the negative energies you are exposed to or radiate... you should repeat the cleaning process more often.
Otherwise, if you do it every night of the full moon, it is enough and you will only have to do the first part ( clean and load ).