The Market Forge chamber is made of aluminum, which is very soft and sensitive to oxygen. Usually after a complete clean, we can see that the chamber’s inside color will get gray after 1 or 2 cycles, but a continuous residue buildup is unlikely.
Because Market Forge sterilizer does not come with a water reservoir, we do not think that residue will result from something inside the machine beforehand.
What we can suggest you do is wash this chamber with water many times to make sure the chamber inside as clean as possible. After that, run some testing cycles again.
Thank you -
Your Sterilizer expert