Can someone help me with stopping vehicle spammers?

Ive made this code below and it duplicates the car from server storage and spawns it in a certain place, my problem is if someone is to spawn a different car the old one will still be there and the spawn button can be pressed multiple times and the cars will spawn on each other is there a way I could alter this script?

script.Parent.MouseButton1Click:connect(function(GetCar)
        Mod = game.ServerStorage.BMW330DCIV
        clone = Mod:clone()
        clone.Parent = workspace
    clone:MakeJoints()

end)

I also have a local script in the button too which teleports the player to the car and deactivates the Gui which is here

local Button = script.Parent
    Button.MouseButton1Click:Connect(function()
        local player = game.Players.LocalPlayer
        player.Character.HumanoidRootPart.CFrame = CFrame.new(-19.3, 1.05, 57.68)
    script.Parent.Parent.Parent.Enabled = false
end)

thanks