That's why we invented shell scripts and cron!
On a serious note, what type of tasks would you consider mundane that you attribute to your ADHD to cause you to not want to do them that any non-ADHD person would also not have procrastination problems? Are these specific to work like filling out time sheets or other TPS reports? Home tasks like laundry/dishes/trash? All of the above? As a non-ADHD person, I hate all of the above tasks and only do them because it's part of adulting. Can't get paid without time sheets (this is my biggest hate). I'd rather do laundry (folding/ironing) than fill out time sheets. I have no rational explanation as it is a rather simple thing.
The difference is that buckling down and focusing... Don't always work for me. That's the fundamental difference that normal people don't get. That rather simple thing is basically the problem.
I'm pretty good at "adulting" and otherwise coping with my life but I hit roadblocks that other people sail by. I can do very complicated, difficult and tedious tasks but sometimes get stuck doing simple things like paying a parking ticket. I know how to do it. I know when it's due. I know I'll pay a penalty if I pay it late. I think about it all the time. But doing it is like lifting an incredibly heavy weight. Normal people don't feel the weight and think I'm lazy.
Mundane is probably not exactly the right word tbh, but it's hard to find the right word. I think it would be more accurate to describe it as things with a lot of upfront planning involved. If I can basically react my way through something to completion I can get into hyperfocus and just blaze through it.
A lot of the time the way I've gotten around this is to force it to be an emergency so I can't think about it too much. Either by leaving it to the last second or just convincing myself.
And that's a really common pattern you see in people before they get ADHD diagnoses.
The difference being my wife breaks down in tears every 3 months because she woke up to dishes in the sink _again_ and wasn't able to use her coffee cup because, though I meant to do them and said I would, I wound up not doing them.
That was the first 5 years of my marriage. Repeat for laundry. Repeat for trash.
For work I was on a list of 5 people out of 1000 person company who's names had gone all the way to the CEO for not filling out timesheets correctly.
I hope that makes the problem a little clearer for those who think "but everyone has trouble with that stuff"
Also, every time a post on here comes up about elaborate methods of achieving focus the comments are full of people typical-minding what really might actually be ADHD (the whole "everyone is like this right?" thing) and I'm just sitting there like.. maybe you should look into this it probably shouldn't be that hard.
Of course if you post that you get a bunch of replies from people who insist that, "no, actually, it's cell phones' fault" or that it's totally normal to absolutely loathe doing any mundane task.