The next type of hardwood floor is solid hardwood floors. There is a mixed opinion about whether or not you can use a steam cleaner on this type of hardwood floor however, it is generally safe provided that it is solid wood and sealed. If you have a If you have a type of hardwood floor that does not have a seal on it then it is not safe.
For floor types that are not safe to use a steam cleaner on always use a microfiber flat mop found at http://www.amazon.com/