Hello, first of all sorry for my English.

I have a cnc router and my z axis had some losing height problems during operation. So i checked if the ballscrew and guide rails were clean. When i turn acme thread by my hand on some point it has difficulty on turning. I use WD 40 and some spray we call car break cleaning spray (I dont know if its same in English). I think there are some wood dust stuck in ball screw. I dont know how to get rid of it. I hope there is an answer for this problem.