Cilajet sealer can be removed with some of the better pre-wax cleaner products like PS21 or Klasse All-in-One.
BTW - Cilajet applied by the dealer is an absolute money making scam for the dealer and while it's good product, it's no better than other similar sealant products on the market! Was it already applied to the car and they forced you to pay for it? Some dealers do that! A couple of years ago, the dealer where I last purchased pushed VERY hard to have me pay $1500(!) for Cilajet application after purchase and when I declined, they were downright insulting by essentially telling me I was a fool to pass it up. I did some research back then into Cilajet... And I found the company (XXPONENT) in So. California that originated the Cilajet formula. I had some interesting email exchanges with the CEO. Unfortunaely, this was a few years ago and I'm not sure they are still in business as I couldn't find them with Google today. The guy revealed that the current Cilajet product isn't even the original! The CEO said he had some consternation about supplying Cilajet with his product because he disagreed with the marketing model. Soooo... Cilajet reverse engineered the sealant and that's what you get now. The CEO sent me a small 10 oz. jar of the original product gratis and I was able to seal three cars with it. I also top the sealant with a high quality carnauba wax like PS21. The original product sells for only $30/ 10 oz. jar! While the dealers may say that Cilajet is "lifetime" and "you'll never have to wax again", it's really only good for about two years when it must be re-applied by the dealer - with a couple hundred dollar charge, of course.