The ease of refilling and cleaning dispensers largely depends on their design and the type of product they dispense. Generally, dispensers with wide openings and simple mechanisms are easier to refill and clean. 
For soap or sanitizer dispensers, models with removable reservoirs or refillable cartridges are typically straightforward to refill. These designs allow users to pour the liquid directly into the container without spills. Some dispensers also feature transparent or semi-transparent bodies, making it easy to monitor the liquid level and know when a refill is needed.
Cleaning is simplified in dispensers with smooth surfaces and minimal crevices, as these features reduce the accumulation of residue and bacteria. Dispensers made from materials like stainless steel or high-quality plastic are often easier to wipe down and sanitize. Additionally, dispensers with detachable parts can be disassembled for thorough cleaning, ensuring all components are free from buildup.
For food dispensers, such as cereal or candy dispensers, those with large openings and gravity-fed mechanisms are generally easier to refill. Cleaning is more manageable if the dispenser can be taken apart, allowing each component to be washed separately. Dishwasher-safe parts further enhance convenience.
In the case of paper towel or toilet paper dispensers, models with simple loading mechanisms, such as those that open with a key or latch, facilitate easy refilling. Cleaning is usually minimal, involving wiping down the exterior surfaces.
Overall, the key factors that contribute to the ease of refilling and cleaning dispensers include the design of the opening, the material used, the complexity of the mechanism, and the ability to disassemble parts. Choosing a dispenser with these features can significantly enhance user convenience and maintain hygiene.