if you have the time and place to do it, the below is a write up...read through even you are farming the job out so you can be specific on what they should do and the specific antifreeze needed
https://wranglertjforum.com/threads/how-to-flush-the-cooling-system-on-your-jeep-wrangler-tj.1737/
https://wranglertjforum.com/threads/how-to-flush-the-cooling-system-on-your-jeep-wrangler-tj.1737/