In the films and everything, yes, it is just the blood that is acidic. That “acidic saliva” comment is a reference to The Devil Wears Prada song “Alien”
An extraneous existence
An earth-ending challenger
Encroaches upon humanity
Destruction, destruction they’re seeking destruction
Each ten feet tall without remorse
Crawling along the walls
I see the eyes, I see the teeth, see the monster coming through the window
Closing, the doors are closing
I see the eyes, I see the teeth, see the monster
One cannot fathom such a phantom
The demon’s mouth hisses with acidic saliva Acidic saliva
Crawling along the walls
I see the eyes, I see the teeth, see the monster coming through the window
Closing, the doors are closing
I see the eyes, I see the teeth, see the monster coming through the window
Game over, we’re done for
Crawling along the walls
Claws extended
No hope to persevere
Closing, the doors are closing
We’ve been surrounded
There’s no way out
Game over, we are done for
In the films and everything, yes, it is just the blood that is acidic. That “acidic saliva” comment is a reference to The Devil Wears Prada song “Alien”
About 1:00 in this music video: https://www.youtube.com/watch?v=EiYMS1z8Lrw
EDIT: Lyrics
Thanks for the heads up.