help to release clear tube off pressure switch , hoover new wave 1100?

hi, i have read some advice about my washer and have tried to follow the instructions of some very helpful people. I need to get the clear tube off the pressure switch, the man giving advice said be very gentle and carefull while doing this, iv tried and it seems not to be budging, i dont want to start tugging at it in case im trying to remove it at the wrong spot or something,, any tips on how to remove it pleaseeee, thankyou