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All the replies are good. I worked a radiator repair shop 50 yrs ago and did a lot of reverse flushes, its a gun that has garden hose attached and a air hose attached, with the radiator detached, it attaches to the outlet hose and exhausts out the inlet hose, then attach to inlet hose and exhaust out the top of block, it fills the block with water then hit the air button, this process is also used on radiator in or out of car.
If your on a budget, fill block and radiator with vinegar, run engine, let set for a day, flush with garden hose, this has been posted before by others on this forum, I've used it and it works.
carry on