White stuff in 'Because of You' PV??

[chibi_sunny]

i actually read a thread that talked about this same subject *ahem* before i actually saw the PV...and even when i was watching it, the thought of that didn't occur to me...
i dont know or have a guess what it is, but if i had to, i would say milk, which is white and pure, but spoils easily, just like the prostitutes...
but the stuff itself, i think glue has too much viscosity to be that....i dont think its paint either...