I'm doing a major cleaning of my car in a couple weekends. Trans fluid, filter, plugs, wires, fuel filter, oil pan and gasket, thermostat, and lastly a coolant flush and switch to Yellow PeakBUT, my coolant tank is dirty, like really bad. I cannot scrub the areas affected, so while I am doing the other work, is there anything, any solution, I could have the tank in to eat away at that dexcool gunk?