oh no you didn't............ well certainly cleaned that engine out
Just drain it, remove bottom rad hose [30 secs]
Give it a good flush out with a garden hose, in the header tank
Fill it up with clean water after re attaching the bottom hose
run the engine for 5 mins, yes run the engine gets all the water out of the waterways inside the engine
remove same hose from rad at the bottom and drain, flush again. Hose back on
Fill with good quality anti-freeze as per manufacturers instructions
Go to specsavers and buy one get one free lol