Yes, both Winix models have a pre-filter which require cleaning from time to time. They can be easily removed and cleaned by either a vacuum cleaner or washed under a tap. The pre-filter captures the larger particles and prolongs the life of the HEPA filter.
The HEPA filter cannot be washed – it should be replaced when alerted by the machine.
The Winix model AUS9500 (Ultimate 5 Stage) also has a washable Activated Carbon filter. Rinsing this filter in clean water rejuvenates the carbons’ absorption ability, however each time it is washed it reduces its life expectancy. Generally, it can be washed about 3-4 times during the 12-month life of the filter cartridge.