Hoshizaki F-500BAF Instruction Manual page 18

3) Air Filter
A plastic mesh air filter removes dirt or dust from the air, and keeps the condenser
from getting clogged. As the filter gets clogged, the icemaker's performance will be
reduced. Check the filter at least twice a month. When clogged, use warm water and
a neutral cleaner to wash the filter.
4) Condenser
Check the condenser once a year, and clean if required by using a brush or vacuum
cleaner. More frequent cleaning may be required depending on the location of the
icemaker.