I started thinking about how my young Victorian woman character would do her laundry in about 1880. She is single and lives alone in London in a rented room. She wouldn't be able to wash more than stockings and handkerchiefs there.
Heavy outer garments, made of wool, weren't washed They were brushed and hung up to air. Stains might be sponged or dabbed with a stain remover.
That left cotton and linen items - dresses, petticoats, underwear, nightgowns, sheets, pillowcases, towels. My character would not have more than two of any of these, three at the most, and not more than one in the wash in any week.
She would have plenty of options. Laundress was one of the most common recorded occupations for women in the nineteenth century censuses.
Some would have worked for the commercial laundries, which operated on a large scale by about 1880.
The Beulah Laundry and Cleaning Works, in South Lambeth Road, offered its services to families, club houses, hotels, ships &c.
The Sunny Bank Laundry Company, Langley Lane, South Lambeth, guaranteed that no chemicals, soap powder or other injurious compounds were used. Linen was well rinsed and 'quite free from the usual odour.'
Women did not only do the washing in these commercial laundries; Mrs E. J. Chapple managed the London and Provincial Steam Laundry in Battersea.
But I think it's most likely that my character would have an arrangement with a neighbour, whereby her laundry is included in that woman's household wash. No money changes hands; my character repays the favour by helping the neighbour in some way.
A character's laundry arrangements don't usually need to be described in detail in a novel. But asking such apparently trivial and irrelevant questions can help to build up a picture of the world a character lives in, how she interacts with her community, what particular skills and abilities she might have and use in her day to day life.