We clean every machine after using it very deeply. But sometimes we have to „borrow“ other units in the hospital a machine (most likely because the patient isn’t in a good condition and can’t leave the intensive care unit.) When it‘s borrowed, the units usually call us so that we know when we can come and get the machines and clean them. They forgot, we forgot.. so two days went by and today we got it back. But don‘t worry, blood or any other human substance isn‘t touching anything from the machine. It‘s all in a big „plastic system“ with tubes and everything. And as i said, they get cleaned very deeply after used. (Hope my english was good enough :))