How to clear canvas html5?

I'm trying to clear a Canvas.

I execute a setInterval function, who calls different "canvas" in any iteration.

After any execution, i call this function:

function deleteCanvas(){
    var canvas = document.getElementById("canvas");
    var context = canvas.getContext("2d");
    context.clearRect(0, 0, context.width,context.height);
    context.beginPath();
}

But no delete the canvas image.

Any idea?

Best regards,