The way I 'fog' our A4 is with Marvel Mystery Oil poured or sprayed into each cylinder,
start the engine for a few seconds and enjoy the smoke coming out of the exhaust and let it sit for the winter.
This procedure can be done a few times a season, or more if necessary.
I'd try it as soon as you can if I were you.
Hopefully your engine still runs; they are pretty tough.
Maurice is correct; we run some RV anti-freeze through the cooling system and drain a few fittings as well.
As for draining the gas tank I used this pump
http://www.defender.com/product.jsp?...5206&id=119134
earlier this spring to remove nearly 10 gallons of old fuel into 5 gallon containers. The last gallon or so of fuel is shown in the picture I'm attaching. Not good!
I am either stupid and/or lazy so I apologize for the oversize picture.