Midas will piss in your radiator, if you're lucky, and top it off with whatever cheap crap they have to make the coolant reservoir look good. They don't even flush the toilet after they take a crap, much less flush your radiator. There have been many stings on these shops, and they put cameras under the hood and under the rig, and they find out that not only don't they flush it, they top it off with the wrong stuff.
Buy a gallon of the stuff they tell you to use. Get it from Mopar if you can't find that exact thing. There are no shortage of fluids that say "mixes with any color", or "compatible with every brand". It's a load of crap. I can mix urine and motor oil, but that doesn't make it a good thing to put in my expensive engine. If you can prove they ruined your motor, they guarantee you'll get your $13 back.
My radiator had recently been replaced when I bought it, but the antifreeze looked like mud. I removed the overflow bottle (not hard), and punched a hole in that little grate so I could pressure wash it. It came out great. Then, with a cool engine, I drained the radiator and ran a garden hose into the top until everything started looking clean. Then I started the engine, heat on high, while fresh water ran in and the petcock was open draining some. I made sure the hose was going faster than the drain. After about 10 minutes, it started looking less rusty, so I shut the valve and closed the radiator cap, letting the engine warm up.
Then after it cooled again, I did the same drain, run water while draining and running.
Then I drove around with pure tap water for a 30 minute drive, and repeated the process. I kept doing this until my water stayed clear.
Then, I drained the radiator, and did another round of running and flushing. Once everything looked clean, I drained all I could and filled back with distilled water from bi-mart (89 cents a gallon). I ran it for a bit, and drained again, figuring I've gotten most of the minerals out from the tap water. Then I refilled again with 1 gallon of HOAT, putting some in the overflow bottle, and the rest in the radiator, and topped up with distilled water. I drove the front end up on RV leveling blocks, and ran the engine, topping with distilled water as needed, until the thermostat opened (you'll see the flow start) and kept topping up until it quit taking it. Then I closed the cap, topped off the overflow to the fill mark, and went for a drive.
It's been clean as new for the last 8 months since doing that. I wouldn't pay those scammers to run some bs flush. You know they take every shortcut they can, and may not even do anything but top you off with the wrong fluid. Either use the dealer (not sure they do much better, but I assume so), or do it yourself. It's really pretty easy.
I strongly suggest you don't buy any of that gimmick fluid that claims to clean things out or stop leaks, or any other magic. It's as likely to clog your heater as to improve your cooling, and if you have a leak, just fix the damn leak.