Also be aware that terpene cleaners or terpene rinse water may attack PVC plumbing in your cleaning equipment. Hazards Terpenes are flammable so spraying is not recommended, except in specially designed equipment. Terpenes are not highly volatile, but they are VOCs and may be regulated under the new Clean Air Act. Unfortunately, toothpaste is not often used for industrial cleaning. Yes, terpenes are safer to use than many solvents, but to compare a terpene food additive to a terpene paint stripper is not only misleading, it is reckless.
Terpene cleaners are mildly neurotoxic.
There is a controversy about the carcinogenicity of D-Limonene. One preliminary study linked D-limonene to testicular cancer in male rats. Another study indicates that those results do not apply to humans. And wear your gloves. Recyclability With any cleaning chemical, recyclability is dependent on the ability to separate the soils and oils from the cleaning solution.