What's happening
ADHD and laundry usually fall apart at the same point: the bit after you press start. Putting a wash on feels like the job's done, so your brain ticks it off and moves on. The machine beeps while you're in another room, or you've gone out, and the load just sits there. Two days later you open the door, get hit by that musty smell and wash the whole lot again.
How to get moving
Put a wash on only when you'll be in for the whole cycle, and set a phone timer for the cycle time the second you press start. Call the timer "Washing out" so it tells you what to do, not just that time's up. Before you load the machine, get the clothes horse up or clear the radiator, so there's already somewhere for the wet stuff to go.
If the horse is still full of dry clothes from last time, that's usually where it jams. Don't fold them. Pull everything into a basket, take it to the bedroom and hang the new load straight away. Folding can wait a day. Wet washing can't. When the timer goes, the only job is moving clothes from one place to the next.
Important tip
If you're drying indoors, pick a room where you can open a window. The government's guidance on damp and mould lists drying laundry as one of the everyday things that adds moisture to the air, and when that moisture can't get out, condensation can lead to damp and mould over time.
This is lived-experience content. It is not a promise that a particular idea will work for everybody.