i dont no about your 1.5 but on my mk2 it is held on with 3m tape it was a ball ach to clean of if your taking them off to colour code i would leave them on and just mask the car up and paint them on the car

im just mentioning this as i found this out after a took 2 off it took me ages to get it all cleaned up i stuck them back on and i was so fed up with it that i haven't even colour coded them yet

oh and if your wanting to take them of completely there may be holes behind them mine dose