Dusting. Dust everything, even things you don't normally mess with. The top of the TV and bookshelves, the light fixtures, the molding: work from the top down with a microfiber cloth or soft rag damp with vinegar or water and low-sudsing dishsoap.
Vacuuming. After you finish dusting is the perfect time to vacuum. All that dust had to go somewhere, and a lot of it ended up on your floor and furniture! Grab your vacuum and throw on an attachment, taking care of the furniture first. Follow that up with a thorough vacuum of the carpet.
Windows. Clean every part of your windows: glass, sills, frames, and window treatments. You'll be surprised by what a difference that level of clean makes—the whole room really will look brighter.
Organize. Whether it's your desk, the kitchen counter, or your bookshelf that needs organizing, there's probably an area in your home you immediately cringe when you think of it. Stop the cringing and just tackle it. It will be a relief to finally have it clean!
Enjoy your Spring and Summer in a much cleaner house!