My father was an upholsterer. We saw many people wash covers in the washer & even if not dried in the dryer, the covers often shrink. I would recommend using something like the Bissel Little Green Machine for upholstery. Once clean, use ScotchGuard to prevent dirt & stains.
Melody & Mike, Jake the hearing dog
Cats: Silver, Cleo, Lily, Almond, & the late Zima
2001 Winnebago Adventurer 35U