I cleaned my throttle body earlier in the year. No sealants are required to fix it back in place.
I watched quite a few videos on YouTube, everybody does it different. All have different advice. From all the videos pick what advice you think makes sense.
My procedure was:
Disconnect battery, spray cleaner into TB, let it sit for an hour or so the electrical system discharges.
Take off TB fully from car. Get it on a bench and clean it with old microfibre clothes sprayed with the cleaner. You may find a carbon ridge around the barrel. Do not be too rough, some say it has a special coating that you don't want to remove, I'm not 100% sure about that but it is a delicate piece of kit. Make sure you get cleaner on the pivot points and any small passage ways are clear.
I soaked it and wiped it several times, it was out of the car a few hours.
When I put it back and connected the battery the whole car went into reset, everything clicks, whirs, buzzes and cycles for quite a few seconds until I could start it.