Point-and-shoot and DSLR cameras have a knack for attracting dirt, and that grime can show up in pictures. Sand and moisture at the beach can render a good camera unusable. Here’s how to clean it up.

Have you ever gone to use a mouse, camera or remote control that's been sitting around for a while, only to find the batteries and their compartment covered in a white-ish crusty residue? That crust ...