It is good that the cleaning services provide duct cleaning making sure that the lint accumulation is removed.
The other part of the dryer where lint accumulation can happen is the vents. It is where the outdoor air goes in and be converted into hot air that dries the clothes. However, if the lint clogs the vent, the problem starts from there and the appliance cannot work properly. It is proper to keep that lint away from the clogs. To do this, a regular and intensive cleaning of the vents is required. Hand washing the covers can also help. It eradicates the worries on having the risk of fire as well.