I would highly recommend PBW (powder brewery wash) for cleaning any piece. Non-toxic, environmentally friendly, and even more effective than pipe cleaners when trying to get to the hard-to-reach spots of bubblers et al.
Orange Chronic is just ISO with small pieces of salt. It's got some Citrus added to help cut into the grime
Limolene is a really great solvent if you pick some up
So is PBW https://www.amazon.com/PBW-Five-Star-2-oz/dp/B006O2E5X6