1998 Dodge Neon Blown Head gasket

I was told to drain out the coolant, run the engine clean with water (really well to remove the coolant) then run moroso (spelling?) to seal up any possible cracks in the block. I was told this is a quick (and inexpensive) way to fix a possible blown head gasket. I know two people who have done this with their cheap little cars and it worked. I got the little neon for $700 so I don't want to spend the $1,000 quoted to me for replacing the possible blown head gasket.

Any thoughts!?

Thanks!