Honesty - I did the flush and reverse flushes. Looking back, I should have just replaced the heater core and saved myself a lot of time.If you feel like it, it'd be good to get a good write up on both if these and some pics on this project. It's $175 for the kit, but IF it works in keeping the system unclogged, then it's a fair fix.
I'm gonna do the basic reverse flush of the heater core this week, as it's the least involved. Hopefully I'll 'see' what comes out of there, if anything.
(FYI, I see some people fuzzing over the clean up afterwards if using distilled water or having to blow air into it to dry it; from working on boat engines, I can tell you the easiest solution is to just to feed NEW antifreeze AFTER you are done with the flushing (right into the short hose into the core, before you remove both hoses and finish the job), so as not to leave water or air in the core, but instead it'll have (new) antifreeze. Then you can run the engine, lift the front end, burp it, whatever else you wanna do to it is fine, but you'll only have antifreeze running through the system. It might waste a bit more, but you know for sure whats in there)
The core is clogged. It's almost impossible to clean it. You may break a bunch of it free and get it flowing through it again... but the loose particles that are in there still will just clog up the same spot.
You'll loose heat in a few days. All the videos of guys doing the flush all have done it multiple times. It's a heater repair tease...
Just buy a core. About a foot of hose and 4 clamps. Also, drain and flush the system. Do the core swap while it's drained. Refill and enjoy.
My old heater core is drained. It weighs almost twice as much as the new one. And I flushed the core numerous times and pulled a ton of junk out.