For Hikvision domes that have a wiper and feature an alarm output using a WA series washer could not be easier. All you need is the twin-jet mount and then you are all set. Use the alarm output to connect directly to the control input on the washer PSU. You can activate the washer using that either from the Hikvision DVR or VMS.
Drawing : Washer jet mount for Hikvision domes