They won’t see it without opening it but they don’t have to take everything out. They will literally be able to see the bacteria - particularly on stainless components in the apparatus.
My response would Be if it’s infection and they don’t open it up to wash with antibiotics that will be worse. Ask if you can get an infectious disease consult and ask him-her if the apparatus or part of it has infection slime on it,’how will you know that if you don’t go in And look.

Why don’t you want to go to mayo.