For heavy wax buildup, go for cerumenolytic drops that contain carbamide peroxide or hydrogen peroxide. Safety and quality: ...

The active ingredients tend to be hydrogen peroxide ... a pressurised flow of water into the ear canal to dislodge the wax. However, although this may remove the wax, it can sometimes be painful ...

Earwax removal in children is avoided ... stinging if there is dryness and cracking in the ear. Baby oil, mineral oil, and diluted hydrogen peroxide are generally safe for babies and children.