I did some reading up on your brand Loach. From what I can tell, it’s not actually pre-seasoned, so you’ll want to do that.
I run the hot water and rinse the hot pan under it. The sizzling provides a little abrasive action to stuck bits. If the stuck bits are really stuck, I’ll run the plastic brush around the pan and rinse them out. Then I put the pan back on the stove (usually the element is off, but still hot) and wipe with a paper towel to dry it and to spread any remaining grease.
Dousing a hot pan is a great way to warp it. I have a frying pan almost as bowed as a wok from when I didn’t know better.
I know. But it hasn’t.
Cast iron pans are great weapons for home defense.
In the old GURPS 3e book they claimed you could use one as a mace or a shield.
aceplace57:
Already suggested at post # 6, with link to instructional video, to boot!
Use it to play ping-pong. When you switch back to a regular paddle, you’ll be amazed at how much power you have. 
What to do with a cast iron pan? My suggestion: blackened salmon.