The problem you are facing is that you need to back flush (in the reverse direction of normal coolant flow), and remove the thermostat from the housing at the same time to have any hope of getting most if not all of the stuff out of the system. That requires building some fixtures that accomplish this and passing the outbound water through a filter screen to be able to see when you’ve gotten everything that is going to come out.
Even with all this, you will still never get it all out; there are just too many nooks and crannies where bits can get hung up.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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