Blox
Blox is a germ killing product first heard advertised in Grand Theft Auto: Vice City on Flash FM. According to Kent Paul's website, in 1987 Blox was found to be too toxic for domestic usage and became part of US defense strategy instead.
It is later seen in Grand Theft Auto: Vice City Stories, wherein you can see it in grocery stores like FIDL, and in Grand Theft Auto IV, where it can be seen inside Cluckin' Bell restaurants, the kitchen of the Majestic Hotel, and inside Bucky Sligo's house.
The name "Blox" may be a parody of the company Clorox.