California Ultimate Cleaners LLC California Ultimate Cleaners LLC California Ultimate Cleaners LLC California Ultimate Cleaners LLC . I am Jennifer Rosato, the CEO of California Ultimate Cleaners. Between the east coast and the Bay Area, I have over 20 years of experience in the cleaning field. Since arriving in the Bay Area, I have noticed a great lack of comprehensive environmental cleaning and sanitation, with copious amounts of cross contamination present in facilities, both commercial and residential. Due to California's relatively warm climate, the lack of freezing temperatures allows for the breeding of bacteria from year to year.