No, Marilyn didn’t own a washer or a dryer.
None of this is mentioned in the police report. The story comes from Jack Clemmons (police officer who turned out to be a dirty cop) in Goddess by Anthony Summers, a book full of falsehoods. Clemmons and two other officers were there for a maximum of twenty minutes.
The layout of Marilyn’s home was also somewhat different to what Clemmons claims discovered by author Gary Vitacco-Robles. Receipts show that Marilyn’s items were always sent out to be cleaned and therefore had no requirement for a washer/dryer at home.