[3] On December 8, 1980, Soltero was appointed to the South Tucson city council on a 4–1 vote, with one abstention, to fill a two-month vacancy left by the resignation of Frank Lopez.
[6] On May 2, 1988, Soltero was unanimously appointed mayor of South Tucson by the city council, replacing Dan Eckstrom, the 15-year incumbent who resigned to become a Pima County Supervisor.
[7] In March 1991, Soltero was one of 15 applicants who applied to represent the 10th district in the Arizona State Senate, a seat vacated by Jesus "Chuy" Higuera due to his resignation amid a corruption investigation.
[9] He was appointed to fill the State Senate vacancy via a 4–1 vote by the Pima County Board of Supervisors on March 29 and sworn in on April 1 along with Armando Ruiz.
"[12] In 1992, Soltero sponsored a bill that would have appropriated $250,000 for a southside Tucson health center for victims of Trichloroethylene (TCE)-contaminated ground water.