Use chemicals, no way you will get rid of it all other wise.
Not sure what you mean by your last question? I would get the while system up to temperature without the thermostat in there, this will allow full flow and maximum flushing. Drain when cooled by removing thermostat housing.
Then run hose pipe through the heater hoses through matrix in both ways, and through block as well, plugging the thermostat housing to fill the block/head and then draining en-masse. Then remove radiator and flush both ways with a hose, again forwards and backwards and allowing it to fill the radiator and quickly empty.
Not sure what you mean by your last question? I would get the while system up to temperature without the thermostat in there, this will allow full flow and maximum flushing. Drain when cooled by removing thermostat housing.
Then run hose pipe through the heater hoses through matrix in both ways, and through block as well, plugging the thermostat housing to fill the block/head and then draining en-masse. Then remove radiator and flush both ways with a hose, again forwards and backwards and allowing it to fill the radiator and quickly empty.
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