How do I make a part that gets removed on click, but only a "Janitor" team can do it?

Add a ClickDetector to the part, then using a Script or LocalScript and listening to the clickdetector.MouseClick event, check if the player (MouseClick event also gives you the Player that clicked it) is in the janitor team... Then just delete it with part:Destroy()

Put this script under the part and the part should has a ClickDetector

local Teams = game.Teams

script.Parent.ClickDetector.MouseClick:Connect(function(Player)
if Player.TeamColor == game.Teams.Janitor.TeamColor then
script.Parent:Destroy()
end)