Take a small sewing (sp?) needle, and poke it through the little hole from the washer nozzle. Do that a couple times, and then with a can of compressed air, spray all the loosened dried wax away
Inlieu of the needle find a very small thin wire like those used to tie tags on to objects...and insert it....be careful not to make the small hole larger or your squirting patter will change.....
If you use aire go back and make sure the hoses under the hood stay connected and have not slid loose...
Just as advice, a couple pieces of masking tape real small over the nozzles will prevent wax sling or crud from building up during detailing. Also, on may cars the little hoses that go to the nozzles get crimped or plugged. Check them too.