Can a 35mm film roll that went through the washing machine still be developed?

Contrary to some comments here, a 135 film cartridge is very open to water intrusion. The film slot and both spindle holes are designed only to keep out light. The cartridge filled with water in just a few seconds after it was submerged. If you still have a a professional photo lab, preferably one with a darkroom and someone who knows how to use it, I would take it there. If the film wasn't exposed to any oxidising chemicals (bleach or peroxide), it may be fine after some special handling. The film in the cartridge naturally is springy and is usually resting in a hollow roll against the outside walls of the cartridge, so resist the urge to turn the cartridge spindle now since the wet film may have welded itself together and turning the spindle could damage it. In the darkroom, I would carefully remove the cartridge end and gently see how easily the roll comes out. If it won't, I would soak the whole thing in plain water for a while and try again. It should soften up and be able to be unrolled to a reel and thoroughly washed. Once clean, they can either develop it manually while still in the reel, or dry it and reload it into a cartridge so it can be sent off to a lab for normal machine processing.