When you are not wearing your jewellery, especially chains and necklaces, put them back in their cases.
It is essential to close the chains to avoid knots.

To clean them, place them for 5 minutes in lukewarm water and washing-up liquid, then brush them gently with a soft toothbrush, you will obtain remarkable results with an electric toothbrush. Rinse with warm water and dry with a soft cloth. 

Tutorial available here on our instagram account

In case of knots on your chains, take two thin pins, lay your chain flat on a table, prick the first pin in the center of the knot and with the second, prick from the center of the knot outward to loosen it.

For a more professional cleaning, you can go to the workshop.