how to remove dealership's sticker from car?

If it's just the glue residue then WD-40, Goof-Off, Goo Gone or similar substances will remove the glue. Wash thoroughly afterwards. If the sticker itself is still partially adhering, using a hair dryer to warm it up real good will allow you to peel it up then use one of the glue removal choices.

use a hair dryer and heat up the sticker but be carfull you can burn the paint and cause it to look worse then just peel off the sticker and use goo gone to remove the residue best thing to do is bring the car to the dealer or another dealer of the same make and ask them to remove it your salesman will get the sticker removed i know i sell toyota's

Hi Jenny;

Don't use any chemicals, as they may damage the finish. All you need is a hair dryer. Blow the hot air over the sticker and it will come off easily. Don't hold the dryer in one place for long to avoid over heating the paint.

Goo gone seems to do a fairly good job. So does WD 40. With either product, test a small spot first.

I agree with the hair dryer, then use goo gone or equivalent to get the remaining adhesive off.

I would definitely try goo gone! It has worked every time I have used it and never has damaged anything.

window clean will soft the glue or anything with ammonium in it will work

Kerosene also takes it off.

If that doesn't work, try rubbing alcohol and a terrycloth rag.