I use my engine all winter so I have never had to 'fog' it, but I did want to comment on using 'pink' anti-freeze. At least around here, the pink stuff is made for watertanks and other potable waterlines. Because of that purpose it lacks the lubricants that are typically included with antifreeze intended for engines and other water cooled equipment (refrigeration and AC for example). If your engine is raw water cooled and you run anti-freeze through it, then you don't need to drain the block. You don't need to drain the block on fresh water cooled engines if you are running an antifreeze/water mixture on the fresh water side, except to replace the antifreeze on some reasonable basis (see manual).