If you have a shit ton of complimentary Steam games on your profile. Run this script in the console of Google Chrome to uninstall all of them and remove the licenses from your account.

To open the console on Google Chrome press CTRL-SHIFT-I.

/*
This isn't tested and is not recommended for use.
Use at your own risk.

Large parts of code are taken from https://steamdb.info/freepackages/
*/
var removeLinks = jQuery('.account_table a');
var total = removeLinks.length;
var loaded = 0;
var modal = ShowBlockingWaitDialog( 'Executing…',
	    		'Please wait until all requests finish. Ignore all the errors, let it finish.');
removeLinks.each(function(i, el) {
	var match = el.href.match( /javascript:RemoveFreeLicense\( ([0-9]+), '/ );
	if(match !== null) {
		var packageid= +match[1];
		jQuery.post(
			'https://store.steampowered.com/account/removelicense',
			{
				sessionid: g_sessionID,
				packageid: packageid
			}
		).always(function() {
			loaded++;
			modal.Dismiss();
			if(loaded >= total) {
				location.reload();
			} else {
				modal = ShowBlockingWaitDialog( 'Executing…',
							'Loaded <b>' + loaded + '</b>/' + total + '.' );
			}
		});
	} else {
		loaded++;
	}
});