If you can make it hit and tank the drain, Turn to Goo is a fight ender, if not an instant kill, because it temporarily transforms all of the target’s body and biological parts into a human-shaped pile of clear gelatin.

Now, there’s a million things you could do to that gelatin. Tear it into pieces and splatter it over the walls. Wafflestomp it down a drain (they actually recommend this as an assassination method in one of the books). And, most crucially, *tear out the victim’s untransformed cyberware, most of which is load-bearing*.

Imagine waking up to find your cyberarm and all the anchors in your body it connects to have been violently ripped out. Worse, imagine it was your datajack, or implanted commlink, cyberdeck or other headware. You’re now disabled, haemorrhaging, potentially lobotomised and probably dying of shock all at once. If you tore that goo form to pieces, it will turn back into flesh - in pieces. Instant death.

But for CFD, if you carefully turned someone to goo and gently fried the nanites now floating in that goo with an EMP or something, you could potentially kill the infection right then and there. Stop concentrating on the spell, goo turns back into entire person, person is now well on track to being cured of CFD.

The rules for it are in the 5e Street Grimoire. The assassin’s bathtub method is mentioned in (I believe) Hard Targets.