Remove the block plugs on each side and drain so you don’t get coolant inside the cylinders. Then you don’t have to waste time cleaning it out of where it doesn’t belong. 9/16” Six point socket is your friend.
If you remove the block plugs to drain the block, then I suggest you replace the plugs with petcocks (like a radiator drain) rather than just putting the plugs back in.
That will make it much easier to drain your block the next time you need to.
