Clear Canvas WebGL, Three.JS

I am working with WebGLRenderer in three.js file and I cannot clear the canvas. Basically, I have a method that adds another object to the scene, but clears up the children before adding them. For example,

group = new THREE.Object3D();

function add(object){
    group.children = [];//clears the group children first


I thought it would make it clear, but I was wrong. I'm used to canvasrendering doing this for me. Does anyone know how I need to clear the WebGL canvas?


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