How to filter out an object from an large object on basis of certain value of one of the property.

defaultSettings = {    
'header1': {
    key: '00_02',
    element: {
        'test1': '',                        
    },
    elementName: 'footer'
},    
'enabled': {},    
'header2': [
    {
        key: '',
        value: {
            msg1: {},
            msg2: 'message2',                
        },
        elementName: 'unwanted-element1'
    }       
],
'header3': {        
    info: '',        
    headline: ''
},        
};

I want to remove the object where elementName: 'unwanted-element1' from defaultSettings

I am trying something like

for (let key of Object.keys(defaultSettings)) {                        
    if(key === 'header2'){
        if(key['elementName'] == 'unwanted-element1' ){
            //delete that particular object.
        }
    }
}
console.log(defaultSettings);

Output expected :

{    
'header1': {
    key: '00_02',
    element: {
        'test1': '',                        
    },
    elementName: 'footer'
},    
'enabled': {},    
'header2': [],
'header3': {        
    info: '',        
    headline: ''
},        
}

Kindly suggest better approach to achieve this.