The blue liquid

[yellow snow predator]

It looked to me that the blue stuff never seemed to empty

[Kriszilla]

Yeah, a lot seemed to be coming out, but there was always more.

[yellow snow predator]

And remeber billy don't ever drink blue pred juice.......or yellow snow

[Bishop2]

My answer to the question. Strengthened alien blood?

Alien blood has been shown to eat through metal floors of ships and colonies.  This stuff doesn't even affect dirt, grass and mud.  It's very oddly selective.