Jammer said:
The pink antifreeze is propylene glycol mixed with water at about a 50% ratio. Propylene glycol is not an environmental toxin. In purer form it's used in food as a humectant.
It is more a matter of concentrated amounts discharged and dilution/evaporation. Too much of anything, even bubble gum will kill the mouse.
Methanol is involved daily including through the consumption of various foods, and products washed away such as paint thinners and strippers, adhesives, cleaners, and inks. The theme has to remain not vast quanties in one concentrated area. A cup or two of already diluted windshield wash and subsequent dilution into a holding tank, then subject to evaoporation and biodegradation ( or combining with some metals
is not significant considering the further subsequent sewage treatment flows dilution.
Natural emission sources of methanol include volcanic gases, vegetation, and microbes; note methanol is also formed during biological decomposition of biological wastes, sewage, and sludge.
Unless spilled in high concentrations to ground water, it bio's out in soils via Methylobacterium and Methylomonas capable of utilizing methanol. Note methanol in aquatic organisms is not expected to be significant based on an estimated bioconcentration factor of 0.2
A diluted cup (far from 100%) or two diluted in our holding tanks is insignificant concentrations and gets further diluted in the sani sewage treatment path by exponential amounts and treated.
His use and disposal to the medium is not significant.