Wrap it with 95% alcohol on a special 500g weight wharf (the area of the test head is about 1cm after the cotton cloth is wrapped) and wipe it back and forth 15 times without any falling off or blur.
Wipe back and forth 15 times with 95% alcohol, wrapped in a dedicated 500g weight dock (about 1cm area of the test head after wrapping in cotton) without any shedding or blur.
Use 95% alcohol and wrap it on the special 500g weight Wharf (the area of the test head is about 1cm after the cotton cloth is wrapped) and wipe it back and forth for 15 times without any falling off and blurring.<br>