Holes and cracks in concrete only get worse if left alone, especially in colder climates with freeze/thaw cycles.
As long as you’re patching a hole, it’s a good idea to clean and seal the concrete too. Clean one section at a time, do your repairs, then apply a water seal. Since concrete’s worst enemy is water, the water seal will help protect it against future damage.
Stubborn areas may take a second cleaning.
A dull, porous surface is a good indication that the concrete needs to be sealed. Let newly sealed concrete dry four hours before you walk on it and 24 hours before you drive on it.

Step-by-step guide
Experiment to get a sense of how close to hold the nozzle to the surface. Hold on tight so the pressure washer doesn’t get away from you.
Let the concrete dry completely, then dig out all the loose debris from the hole.
The new concrete patch will hold best if the cavity is rounded, with the top overhanging the sides. To hollow it out, use a star drill to chisel away some of the lower concrete. Chisel it out all the way around the hole. Then clean out the debris.
Mix the concrete a little soupier than usual so it will fill the cavity well. Push it in with your shovel to make sure it gets all around. Overfill the hole a little, then trowel off the excess.
When the concrete has cured, apply a water seal with either a roller or a sprayer.

Safety
Wear eye protection when you clean, patch, and seal concrete.

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