Ember cannot set attribute using set method

I have my custom Ember Component class and am trying to reset some attribute values

formData: Ember.Object.create({}),
resetformData: function() {
    this.formData.attr1 = "";
    this.formData.attr2 = ""; // This works 

        //All the below syntax are not working
        this.formData.set('attr1', "");
        this.formData.set('attr2', "");
        this.set('formData', Ember.Object.create({
            attr1: "",
            attr2: ""           
        }));
        this.set('formData', {
            attr1: "",
            attr2: ""           
        });

},

Now when I call this.resetformData(), I cannot get the attributes to reset using the "set" method syntax.