It is crystalized silica from not maintaining you cooling system.
Possible residue from some sort of radiator additive crap. I would flush the system out and maybe install a new radiator.
CITYLIFE404 answered 2 years ago
Most likely those auto zone stop leak that previous owner pored In and then sold it
This is what i found coming out of radiator hose when it bust open what is it and how did that get in there can anyone help
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