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Inca F-205 Frostguard Deodorant and Toilet Antifreeze was designed for winter application. When used as a pre-charge flushing medium, the formula combines the correct amount of propylene glycol and liquid deodorant to protect railroad toilets from freezing and deodorizes the toilet as well, the company says. The deodorant features special Fresh Airy scent and is available in one-gallon jugs and 55-gallon drums.