Adhesive spots on inside ceiling of FR3

When we were shopping for our first motorhome we pointed out a stain in wall paper kind of hidden behind a moveable chair. The dealer promised it would be gone when we picked up the coach. It wasn't. We tried several different cleaners, but it was still there when we traded in the coach. In other words you might think about looking at the same model at a different dealer.

Offer to buy if they fix it first.

Paint it with a primer then a top coat. Probably better than the primer and finish in one paint.

Thanks for the advise. The dealer says it looks like an adhesive where the installer carelessly must have smeared on the ceiling while installing during manufacture. I can see maybe in a couple small spots but there are spots in the ceiling from the front of the coach all the way back to the rear bedroom.
The spots are an orange type color. Went up on the roof and all looks fine regarding leaks but who knows.

We did look at other fr3's but to tell ya the truth we didn't notice. Since this unit is the one we had decided to purchase because of the price, we checked it over with a fine tooth comb, finding the spots.