If you've got metal surfaces ... an old car whose doors are peeling off in sheets from sitting outside and rusting). When it isn't removed, rust can actually be the death knell of a favorite ...

Nairobi, Kenya (CNN)-- Deep in Kibera, Kenya's largest slum, stands Anna Wanjiru's small shop, made out of yellow-painted planks of wood with rusty tin sheets for the roof. Inside, shelves are ...

Nairobi, Kenya (CNN)-- Deep in Kibera, Kenya's largest slum, stands Anna Wanjiru's small shop, made out of yellow-painted planks of wood with rusty tin sheets for the roof. Inside, shelves are ...