Hi, sorry for the delayed reply.

This might not be applicable to you, but in the U.S., all vehicles have a Vehicle Identification Number (VIN), and it’s in multiple places on the vehicle. For some reason, dealerships try to sell you this service where they etch (scratch/write) the VIN into the glass on each of your windows. They claim this is a window theft deterrent, but I don’t think it really is. I’ve also never in my 43 years of life heard anybody complain about having had their windows stolen.

They also try to sell you on paint sealant on the exterior of your vehicle. Or at least they used to - I’ve purchased 11 vehicles in my time, but haven’t gotten one in the past 5 years, so they may not. In my opinion, the paint that manufacturers use is good enough and an extra sealant isn’t beneficial.

Both of these services are pretty expensive, and the finance people will often really pressure you to buy them. I’ve actually gone into their offices with my own financing before, and been like, “Hi, it’s nice to meet you. I’m glad the deal is all negotiated. I’m not buying window etching or sealant, so please don’t try to sell it to me.” It’s worked so far.