Sensor system with cleaning

A computer comprising a processor and a memory storing instructions executable by the processor to:

• in response to detecting an obstruction on a sensor window of a sensor, continuously activate a pump for a first time period;
• and
• during the first time period, operate a valve according to a preset sequence, the valve positioned and operable to control fluid flow from the pump to a liquid nozzle;
• wherein the preset sequence includes opening and then closing the valve at least twice during the first time period.

A method comprising:

• in response to detecting an obstruction on the sensor window, continuously activating a pump for a first time period;
• and
• during the first time period, operating a valve according to a preset sequence, the valve positioned and operable to control fluid flow from the pump to a liquid nozzle;
• wherein the preset sequence includes opening and then closing the valve at least twice during the first time period.