I have one of those green Genesis penguin steamers from back in the day, it wasnt so great at cleaning the tile grouting in the shower, but it will be my goto device when my Kayfun needs cleaning.
It will mess up/ warp acrylic so only use it on steel parts, should be perfect for the coil/deck assembly.
Id be a bit nervous of using it on pyrex in case of cracking because the steam could cause concentrated hot spots.
Don't worry about the Pyrex, as long as you know its pyrex. Pyrex was designed to have a tiny expansion coefficient so getting it hot in one specific area doesn't cause buildup of stresses as in normal glass. It is immune to thermal shock. Steam away all your troubles... as long as it is pyrex. LOL, something I learned in varsity I can actually use...
