comet

Comet is a powdered cleaning product sold in North America and distributed in the USA by Prestige Brands. Scratch Free Comet with Bleach Disinfectant Cleanser contains 1.2% sodium dichloro-s-triazinetrione dihydrate and 98.8% "other" ingredients. The only clues about the other ingredients in the product are disclaimers on the label that mention that the surfactants in the product are biodegradable and that it contains no phosphate. Despite being labeled as scratch free, its label instructs to use plenty of water on delicate surfaces. Comet is not recommended for use on silver, painted surfaces, walls, soft plastic, aluminum, or rubber, except for tires. Mixing Comet with other cleaners, specifically toilet bowl cleaners and products that contain ammonia, is dangerous.
_Wikipedia

An it's nasty gritty acrid!

It makes your mouth all green. ;-)

As unknown comets from space, so come man's thoughts to his mind; but once they're named we all feel MUCH BETTER. --Jan Cox