Avoid chemicals. Strong solutions, soaps, lotions, detergents, chlorine, commercial jewellery cleaning solutions, perfumes, cologne, hairspray, gels, etc. will add a residue layer to the amber, which may create a whitish coating on the amber that could be permanent. Some of these can also eat away at the delicate amber and/or the string holding the amber. If possible, remove your amber if you will be in water.
Keep in mind, amber is fossilized tree resin, so it’s afossil. Amber is millionsof years old so it should not need to be replaced as long as you properly care for it. If you feel it isn’t as effective as it used to be, try rinsing it in lukewarm water and rubbing it with a soft cloth and a little olive oil to restore its effectiveness and shine.