If they use anything it's probably pretty mild. They don't want to damage any screens or stain anything.
It may just cover the additional cost of steering wheel covers, seat covers, sanitizer, etc. This is a pretty standard thing on estimates now. I see a fair number of insurance estimates because body shops will just send a copy of it to order parts and that's basically always on there. What's the insurance company going to say? No? Probably not right now.
Our upsell chemical company came out with some sort of disinfectant product that is a powder in a bottle, applied with some kind of application thing. Apparently the process is more convoluted than the techs want to deal with. I added it to the tech's recommendations as a joke on a random used car inspection, and the service writer actually got it approved, but then the shop foreman brought the bottle back and said they couldn't figure out how to use the applicator device. Oh well, I tried.
BTW, if you bring in a clean car, as I'm sure yours is, they aren't going to waste a bunch of time and product dousing it in cleaner. If they are using a chemical or something, most of it's going in the car with fast food bags for floor mats and some kind of infestation.