I can't stick to a set schedule either. What I've been trying is to set up a 'cleaning time' (same time each day). Then I wrote all my weekly chores on slips of paper and put them in a jar. At cleaning time, I pick one out and do that chore. Once all the papers are out of the jar, I toss them back in and start again. I think its more fun, and usually I pick a chore and think "that's not too bad, I can get that chore done".
This doesn't include laundry or grocery shopping, I just do those when I run out of food or clean clothes.
Before, I tried to have one day as "cleaning day" but that got overwhelming very fast.