It is important to keep your mala clean for it to be both physically and energetically healthy.
Physical Cleaning Methods:
Gentle Wipe:N gently wipe each bead with a soft, damp cloth. Do not soak the mala, especially if it is made of wood or seeds, because this may damage them.
For hard dirt, mix a little bit of mild soap with water, dip a part of the cloth and then wring it out from water, and use it on the beads. After that, use a clean, damp cloth to rinse away all the soap.
Do not use bleach, alcohol, or other harsh chemicals that are capable of ruining the material of your mala beads.