Well, I plan to soak the parts in hot water and dish soap for a few hours, then I'll hit them with compressed air, and spray them out with the hose. I'll run a cycle of hot coolant through at idle for about an hour (to ensure the bike doesn't overheat), then I'll drain and refill. The hoses are still pliable, but yes, the shit in there is hard as a rock. I'll get them sorted out though. The thermostat is still functioning properly, so I'll be reusing that as well. Really just pissing in the wind though, since all that shit will just end up clogging it again.
It pains me to not be able to replace or restore everything back to 'like new' condition (as I did on my bike), but this TL isn't mine, and owner's funding is more or less limited to gaskets and seals only. At the end of the day all I'm really able to do is tear it down, clean parts, replace seals, and otherwise ensure it's safe to ride. I can't even tune it properly due to the hacked up exhaust. But... it is what is I guess.
On a separate note, I'm convinced the previous owner used DexCool as a coolant solution, and that's what caused all the crud build up and water pump failure. Mixing two standard coolants together won't doing anything, except maybe change color and degrade faster, but DexCool will quite easily if the system is low, exposed to air, oil, or any other coolants.
DexCool works as a high mileage coolant, but it's not labeled as such. It's a bit thicker (orange color) and clings to steel surfaces to protects against rust and corrosion. When conditions are perfect (in GM motors) it works perfectly, but when exposed to anything else it turns to a thick mud, solidifies, and eventually eats away at rubber. It's sold at gas stations everywhere around here, which is the reason I accidentally filled my Nissan with it once. Couple days later I realized my mistake, and it took four complete flushes to completely remove it ($130 in coolant). And that's when it's fresh. Based on the information I've found on the internet, there's no way to remove it once it has calcified. In fact, GM has faced a few lawsuits over the years because of it. So yeah, that's what I think happened here. Previous owne grabbed a gallon of it because it was convenient, filled the bike without doing a proper flush, then neglected it like everything else on the bike, and now it may be too late to fully reverse the damage. So now we're left with three possibilities:
#1 It's DexCool, and the system will never be 100% again.
#2 It's some brand of Stop-Leak, which can eventually be purged from the system (costly), however whatever it was being used to plug will eventually begin leaking again. Given that the upper radiator is beat to shit I'm guessing it will be that.
#3 Something else caused it. A wild card. Low coolant over a long period of time, air in the system. Water in the system, etc..