use \Bitrix\Recyclebin\Internals\Models\RecyclebinTable;

use \Bitrix\Recyclebin\Recyclebin;

use \Bitrix\Main\Loader;



Loader::includeModule('recyclebin');



$list = RecyclebinTable::getList([

        'limit'  => 5000,

        'filter' => ['MODULE_ID' => 'CRM'],

        'select' => ['ID']

    ]

)->fetchAll();

foreach ($list as $item) {

    Recyclebin::remove(intval($item['ID'])); 
}