If the wire mesh filter in the wand has a white, what looks like lime scale on it, then this is usually caused by the chemicals. (or Lime scale)
Just use a small wire brush to clean the mesh filter. and replace it. clean and /or replace your jets with Stainless steal as suggested above.
I clean my filters every time I service my machine which is every 100 hours. I have never had a blocked jet that can't be sorted out with a nylon bristle brush being run over them.
Jeremy