Why not go to a commercial cleaning chemical supplier.
They will give you a brand far better than any domestic product thats is available.
You can get caustic or non caustic. If its caustic do not let it get anywhere near aluminium/stainless steel as it will corrode.
Vanquish is another good product. You will also need some tools. Chemicals on there own wont work.
Also a good idea is a heated dip tank so you can soak the rings and racks. There around anything from £400 - 1000's either run off gas or electric.
Dave