The Slosh-O-Matic appears as a large dark-blue machine with a rounded top and two rounded doors on either of its sides, each with a small platform. In every level, a small cable can be seen from the bottom of the device leading into a wall.
The Slosh-O-Matic is the only source of clean water within the game (with the exception of the fresh water found in several toilets in the level Evil Science), and thus the only way to clean the player's mop. When activated with the primary trigger (left-click by default), it will dispense one bucket of water at a time, and occasionally dispense miscellaneous human body parts and a lit dynamite. Like the What A Load Disposal Bins machine, the side of the machine which outputs a bucket is determined by the side of the machine the player is nearest to when operated.
When the Slosh-O-Matic is activated, there is a very short waiting time for the bucket to be dispensed. However, if the machine is to drop a body part instead of a bucket, this can be predicted in advance by a grinding sound, some of the buttons flashing blue, and the increased waiting time between when the machine is activated and when the object is deposited. This allows the player to 'catch' the body part as it exits the machine, rather than simply have it fall to the floor and make several bloody splats.
The water in the bucket will eventually become dirty after several uses, and can be destroyed in the incinerator. If a dirty bucket is knocked over, it will spill its contents over its immediate vicinity, leaving a large mess behind (the size, colour, and amount of which depends on how dirty the bucket was). If the player is to place a body part, human or alien, into a clean bucket, it will progressively but quickly become more dirty if the object is not removed. However, players may use full buckets to carry non-organic items such as bullet shells or other trash, although this can be a challenge to clean one's mop while not spilling the bucket's contents. However, empty buckets may also hold small items just as well.
A vendor has a small chance of giving an advertisement for the several machines and objects, including the Slosh-O-Matic, similarly to when the Slosh-O-Matic is to dispense human remains. Reading the advertisement, it is revealed that the company manufacturing the Slosh-O-Matic is known as Crudson's Automation, and that the Slosh-O-Matic was to cost 339.99 Vaders (probably a form of currency in Viscera Cleanup Detail) among other information. The advertisement reads as follows:
Slosh-O-Matic Affordable, Automated, Ambivalent
When it comes to affordable bucket supply automation, there can only be one choice!
The Slosh-O-Matic now comes with a truly whopping %20 less unforeseen consequences and accidental assimilation!
Now available at a record *339.99 Vaders!"