Heater core cleaning?

Wow, mate. I’d rather buy a new one. Otherwise, it would be too risky to use this. Actually, I would try cleaning it. I have a friend who works at the best cleaning service in york, and he literally can clean anything. But this thing needs to be repaired at least. That’s why I’d rather buy a new one. Btw, I’ve also seen a lot of youtube videos on it. And, guys mostly say that buying a new heater core would be better. Anyway, it’s your safety, and safety should be first. Keep the topic updated. GL