[pooch]

I undertstand where you are coming from.

I had a diesel compressor that leaked water into the sump.

I used to crack the sump plug before every start and drain the water off.

It ran for a few years before the inevitable happened.

You are prob at your end of tries, so I would run it nice and hot . then add the snake oil to radiator and run it another few minutes , then shut it down.

Then hope and pray when you check the drain plug the next day.