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I've heard mixed opinions on Sentinel x400. No harm in trying it. Can you recommend a filter?

I removed a sludged radiator and tried to hose the sludge out. It's fairly stubborn. I tried hitting the side with a hammer whilse hosing and a few other methods of agititing. No success. I was going to try using a power hose to shift the sludge. I'm not sure if this will work as it's a...