The spring cleaner 9001 is a drop cleaner that can be upgraded from the spring cleaner. It requires 6,000 springs to upgrade from the spring cleaner 9000 (10,000 total), either via normal use or by instantly consuming them from the inventory (gaining no charges in the process). This is the final upgrade to the cleaner.
The additional benefits the 9001 has over the previous version are:
The cleaner can now research/dismantle noted items