Dishwashing Soap and Tape Backup Software. (i.e. Get a clean Backup or Clean your backup tapes)
Originally expressed as Palmolive et
Veritas, however,
Madge (the Palmolive saleswoman) was mostly too hands on and Lux was therefore considered more generic.
"There are
parity errors on our
backup tapes. Tell operations 'lux et veritas'!