Many people bring in computers for repair each year. The problem is often on the software level, with the hard drives clogged with viruses, spyware, and fragmentation for the computer to continue to function.
I'd like to invent a dock that, when a hard drive is plugged into it, scans and removes all spyware and viruses, backs up all remaining data to a RAID-0 storage, reformats and restores, and then defragments. The drive would then be returned to the original computer, fresh and maximally functional.
In the time it takes to do this, we can treat the rest of the computer to dust-removing treatment, thereby making an old computer good as new in maybe just half an hour. We also reduce the costs, allowing more people to have a cleaned computer.