My Anti-Exploit script Isn't Deleting Workspace's children, Can someone please Help Me?

I was making this anti-exploit script and it's supposed to delete all of Workspaces's children. Why doesnt it work? This is the script

--[[{{{(((^<<<THIS SCRIPT CHECKS IF THE BRICK CLEANUP SCRIPT WORKS, IF YOU HEAR A LOUD SIREN, SOMEONE HAS EXPLOITED
 IF YOU DO NOT WANT THIS SCRIPT IN THIS TOOL, PLEASE DISABLE IT >>>^)))}}]]--

local h = Instance.new ("Hint")
h.Parent = game.Workspace
h.Text = "ANTI-EXPLOIT/ANTI-SPAM v0.8 BY xXxCONBOY456xXx"


local EXPLOIT = script.Sound

if script.Parent.Parent ~= nil then

wait(26)

if script.Parent.Parent ~= nil then
    EXPLOIT:play()

wait(100)

if script.Parent.Parent ~= nil then

    script.Parent.Parent.Parent.GetChildren:Destroy()

elseif script.Parent.Parent ==nil then

    return

end 

end
end