best coolant flush?

Anyone use CLR?

I've been seeing TV ads claiming how safe it is to use on coffee pots etc...

My Satellite has all sorts of toothpaste thick crap in the block, behind those plugs.

Hey Pan, did you flush the heater core?

I had to put a pressure washer in my heater hoses and flush both ways through the core alternating about a minute each way for (ready) 45 MINUTES before the water ran clear in my Dakota.

I also started using a "corrosion inhibitor" instead of water.
Advance Auto has it for $2 a gallon, but not at all stores.