?I need help with a anti spawn troll car script

Hello I want to make that when the car is respawned it removed the old car but it didn't work can someone help me!

game.Players.PlayerAdded:Connect(function(plr)

	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = plr
	
	local cash = Instance.new("IntValue")
	cash.Name = "Cash"
	cash.Value = 5000
	cash.Parent = leaderstats
	
end)


game.ReplicatedStorage:WaitForChild("CheckPrice").OnServerInvoke = function(player,NameOfCar)
	
	return game.ServerStorage.Cars:FindFirstChild(NameOfCar).Price.Value	
	
end

game.ReplicatedStorage:WaitForChild("SpawnCar").OnServerEvent:Connect(function(player,NameOfCar)

	local car = game.ServerStorage.Cars:FindFirstChild(NameOfCar):Clone()
	car:SetPrimaryPartCFrame(player.Character.HumanoidRootPart.CFrame + Vector3.new(0,0,15))
	car.Parent = workspace
	car:MakeJoints()
	car.Name = player.Name.."'s "..NameOfCar
	
	local oldcar = workspace.FindFirstChild(player.Name.." 's "..NameOfCar)
    if oldcar then
    oldcar:Destroy()
    else?
	
end)