Hey how do i detach my car aerial because i want to get car washed in car garage?

Hi,anyone does know how i can detach my car ariel because my car needs a clean so will get it washed at local petrol garage. my last car i had problem and my aerial broke. i recently bought this car and it doesn`t state in the manual. my car is a vauxhall astra 1.6 x reg 2001, and petrol. thank u xx
Answer
They normally unscrew - get the right sized spanner or pair of pliers and turn anti-clockwise. good luck!