keep flushing till clear water comes out the upper hose lol.

then blow off the lim as best you can, use a leaf blower if need be. ( house vacuum on blow what ever you got to dry it up) then get to work tearing it apart.

make sure once its clear water out the upper hose you stop feeding the rad with new water, and run it till no more water comes out the upper hose. shut it off.

then pull the lower hose, pull them dog bones, rock the engine back and fourth and then start taking it apart.