Is it good to use prestone super flush in my radiator?

I buy a new engine in my honda civic 98 1 year ago. And a months later i find my radiator has some greasy or like milky something like that… And my mechanics check the head gasket and it was ok. No leak at all. But the grease in my radiator is still there.it maybe because the engine is surplus. My question is. It is good to use prestone super flush to get rid of that greasy thing? Is there any effect in my engine if i use that? Or is it good to just flush it with garden hose?

It is not bad to use prestone super flush? I mean no bad reaction to my engine or radiator? My radiator is almost brand new. Its dynamics aluminum radiator. If there anyone that can teach me the procedure of flushing a radiator using a prestone super flush?

Absolutely! Flush your radiator and then refill it with 50/50 premixed antifreeze. If the problem continues then it sounds like oil is leaking into your coolant. There may be a leak in the auxiliary oil cooler (bottom of radiator) and oil is leaking into your coolant that way.Worst case scenario is that you may need to replace the radiator.