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I have never used those products, I have always just filled with distilled water and run a couple of hot then cool down cycles, then drain. Usually good enough to remove all of the last coolant and any unwanted deposits. If you use one of these I would still flush with distilled water to get rid of any leftover chemical. Make sure you set your heat control on high while you are flushing, draining and filling so that you get the heater core too.

I have not had an issue filling and burping as long as the thermostat has a jiggle valve in the 12 oclock position.

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1987 7MGTE
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I'm reluctant to use these products. I had a bad experience in the ancient past where it cleaned too well and the head gasket soon failed. This was on another make and model. You could remove the radiator and soak it separately using a warmed up diluted version of what you're showing. With the engine cold, take the radiator cap off and look inside to see if it needs flushing. When I have my radiator off, I usually back flush it with a garden hose hose and then final rinse it with distilled water. Walmart has the best price on distilled water, usually.
 
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