Unequivocally the best deep cleaner on the market. The process is entirely hands off once you mix the product with boiling water (wear gloves if you need to). Insert some Headie Eddie's, fill your rig to the top (plug lower holes), and just let it sit for 5-8 minutes.

You can watch the product clean your rig for you. Once you rinse it out, it will look better than the day you got it. Plus Isopropyl is very expensive compared to just water, and a little Headie Eddie's goes a long way.