凍結 とうけつ防止 ぼうし ざいじゃなかったです
tōketsubōshizaijanakattadesu

Noun
Desu Copula

The polite, past negative form of 凍結防止剤

1. Wasn't antifreeze.; Wasn't a de-icer.

Past/Perfective
Negative
Polite
Casual Register