How do I remove my cloned Oxygen value after leaving the ToucherPart Zone?

Working on making an oxygen system for a game. Magnitude works fine for planets, but for ships and shuttles I need to use Zones of some sort for each individual room and hallway. I need to add a method to check if the player is no longer in the ToucherPart to delete the Oxygen Value.

while task.wait(1) do -- Time between damage taken. Change it to whatever you want.
    local results = workspace:GetPartsInPart(ToucherPart)
    local players = {}

    for _, part in pairs(results) do
        local humanoid = part.Parent:FindFirstChild("Humanoid")
        if humanoid and not players[part.Parent] then
            players[part.Parent] = true

            print (part.Name)

            local Oxygen = part.Parent:FindFirstChild(SO.Name)
            if not Oxygen then
                print ("Cloning Oxygen To Character")
                SO:Clone().Parent = part.Parent
            end


        end
    end

end