I used a pan cleaning pad for doing this (see pictures in box, link above), rubbing the back panel and used some cleaning petrol. First it was even more sticky and looked very ugly, but after a while rubbing, the paint goes off completely and you will have just the plastic back panel without any paint on it. You should not use any agressive solvent which could eventually dissolve the plastic.
Last edited by Rene Lou on February 4, 2018 04:05.