You should vacuum vents of casing and keyboard. The keyboard is a place where a lot of dust and rubbish collects, amount might surprise you. Keeping dust away from vents of case and coolers inside it you'll prevent overheating computer that leads to damaging components. Also, it's not a good thing to push dust out of computer, it's just going to stay in your room and will eventually get back in computer

Mouse cleaning The mouse can be cleaned by removing ball and dusting inside, remove stray food and human or dog hairs from around rollers. You'll have to keep mouse dry, everything has to be scraped out.

That's just a small bit of advice meant to help you keep your computer clean, it's a good thing to get your computer to a professional cleaning service for better cleaning.

4. If using same babysitter regularly learning to express your desires in a concrete form would be a good idea. Otherwise, you might do just like other parents, and develop a resentment towards babysitter and forget fact that a simple request might be all it's needed.

5. If you forget to remind your babysitter that safety of your child is main concern while he's in their care, babysitter may get scattered among responsibilities and forget safety issues.

That being said, hope you won't have any problems with babysitter that takes care of your kids. Good luck!