to be honest, that’s what they should have done with the server drives, followed by heat treatment with a torch until nothing but melted slag was left. THat’s how you bleach it!
Many moons ago a fellow I worked with who had been stationed at an airbase told a story about how they decommissioned their hard drives. He said that they took them to a double fenced area with armed guards, put them and a number of thermite (spell checker wanted to call it termite) charges into a 6 foot deep hole that had been dug with a backhoe & melted them into a heap of slag which was them buried.
Hammers are so last century.