Organic goop
From Transformers Wiki
Organic goop is miraculous stuff! A brightly-colored liquid which comes from Cybertron's organic core, organic goop can, among other things, cause plants to spontaneously grow, revert a Transformer from a technomatter state, and override Megatron's Vehicon reprogramming. It's a very handy thing to have if you happen to be trying to restore the organic element to Cybertron.
Fiction
Beast Machines cartoon
While trying to dig up water from Cybertron's core, the Maximals stumbled instead on organic goop, which made their orchard spring up where there had been only seeds moments before. Tankor subsequently used the Key to Vector Sigma to turn some of the Maximals into technomatter, and they discovered that the goop also seemed to cure the condition, returning them to their technorganic state. Optimus Primal was able to use a Mole Drone to dig up a whole geyser of goop, curing everyone. The Key
Rattrap used Cybertron's computers to search for more organic goop and stumbled on a catalyst, planted in the computer by Tankor. The catalyst greatly augmented the effects of the goop they had, causing the plants to sprout out of control into a torrent of vines. Meanwhile, Blackarachnia used a sample of the stuff on Thrust, causing him to revert to his pre-Vehicon personality, which unfortunately for her turned out to be Waspinator. Through using the goop on Jetstorm, she discovered that it was he who was Silverbolt, and the lovers were temporarily united. The Catalyst
Rattrap later used a combination of the goop, catalyst program, and seeds to create grenades that could instantly cover Vehicons in vines. End of the Line Blackarachnia dunked Jetstorm into a pool of the stuff, along with a DNA scanner, and was able to reformat him into Silverbolt. In Darkest Knight The core of Cybertron was shown to be swimming in the stuff. Endgame Pt. III: Seeds of the Future