I use my trusty HP Notebook for 8 hours a day (maybe even more). I couldn't finish any tasks without using it. A while ago, I brought my notebook out in a sunny park to check on something on the web. When the sun's rays touched my device, I saw a lot of dust on the screen and other dirty things in between the keyboard keys. I wiped my notebook with a cloth but it didn't remove all the dirt. Where can I get a good computer cleaning kit? How much does one kit cost?