How to remove the agitator in Kenmore washing machine?

I need to clean the washhing machine because the level sensor is not working properly, sometimes it overfills, I checked the level switch, checking for continuity on its terminals and then blowing air making the switch to close or open. I noticed that the plastic basquet around the metal basquet is so dirty with softener and detergent residuals and some of this stuff is in the level switch from where the air hose detects the level. I think it is plugged, so I need to remove the agitator in order to remove the metal basquet to have access to the switch. The washer is a Kenmore model 110