For the vast majority of my 18 years of cleaning I used powdered Formula 90, I will never forget that moist (unless the bucket got bumped open), soft, pale yellow powder with a scent you never forget. Not really pleasant or unpleasant scent, just memorable. When I cleaned repos in the old fiberglass porty days, it was cold water only and Formula 90 did an acceptable job with cold water and a porty on those yucky repo carpets. Then when the new millenium hit, the world of chemistry and heat opened up once I got my first truckmount....I moved on to other detergents, rinses and pre-sprays. But I will never forget "my first".
Take care,
Lisa