Now that your home is decluttered, it will be much easier to keep clean. Do a thorough cleaning or hire someone to do a deep clean. Once it has been really cleaned, it will make getting ready for showings on short notice so much less stressful.
It would be nice if you could count on a lengthy notice before every showing -- but that just won't happen. And the last thing you want to happen is that you will need to decline a showing to a prospective buyer because your house isn't "show" ready.
Develop a routine and take a few minutes every evening to get ready for a showing. Clean up the kitchen after dinner and don't leave those dirty dishes in the sink! In the morning, ensure the bathrooms are tidy, beds are made, and toys, books and clothes are put away. I realize this is a major undertaking but it will be rewarded when you receive an accepted offer.
If you require a longer notice before you will allow a showing (which, of course, is your right), there is a definite possibility that you'll miss a great buyer who just found out about your house. When buyers from out-of-town start looking at houses, they usually have only a few days to find their new home. Even though they had a definite idea of the type of new home they want, after they become more familiar with our local market, they will make changes to their requirements which now includes your house! It happens more than you would think. So you won't always have the luxury of knowing about showings 24 hours ahead of time.
Get everyone in the family on-board with the importance of having your home ready for a showing on short notice. Then be prepared to receive an accepted offer for your hard work!