yung double sided tape mismo maalis...but it will leave a mark as the adhesive has already affected the dash... parang naluluto yung dash sa adhesive... happens to paint also when you put stickers tapos nabilad na sa init ng matagal... pag inalis mo may marka na
as for the ceiling the usual grime naalis naman... better show it to your suking detailer for them to asses it better kung maalis pa...