ask:四级杆怎么清洗？？

你如果必须自己清洗的的话，可以给你些建议：
1. You had better take some photos before you disassemble the quadrupole.
2. Then use the pressure gas to remove some dust on the quadrupole
3. we normally use Methanal to clean the quadrupole.
4. when you put it back, you should check the alignment of the quadrupole