Insert trail when at a certain speed and remove it when below certain speed script

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#1

The scripts below add a trail in attachments when the player exceeds a certain speed, though the problem is the trail doesnt dissapear when the player goes below the certain speed.

For the script to work:
RemoveEvent and a value named Speed in Replicated storage

script 1: goes in ServerScriptService in a normal script

local remoteevent = game.ReplicatedStorage.RemoteEvent
local trail = game.ServerStorage.Trail

remoteevent.OnServerEvent:Connect(function(player)
	local character = player.Character

	-- Trail 1
	local trail1 = trail:Clone()
	trail1.Parent = character
	local attachment0 = Instance.new("Attachment", character.Head)
	attachment0.Name = "TrailAttachment0"
	local attachment1 = Instance.new("Attachment", character.HumanoidRootPart)
	attachment1.Name = "TrailAttachment1"

	trail1.Attachment0 = attachment0
	trail1.Attachment1 = attachment1

	-- Trail 2
	local trail2 = trail:Clone()
	trail2.Parent = character
	local attachment2 = Instance.new("Attachment", character.RightUpperArm)
	attachment2.Name = "TrailAttachment2"
	local attachment3 = Instance.new("Attachment", character.RightHand)
	attachment3.Name = "TrailAttachment3"

	trail2.Attachment0 = attachment2
	trail2.Attachment1 = attachment3

	-- Trail 3
	local trail3 = trail:Clone()
	trail3.Parent = character
	local attachment4 = Instance.new("Attachment", character.LeftUpperArm)
	attachment2.Name = "TrailAttachment4"
	local attachment5 = Instance.new("Attachment", character.LeftHand)
	attachment3.Name = "TrailAttachment5"

	trail3.Attachment0 = attachment4
	trail3.Attachment1 = attachment5

	-- Trail 4
	local trail4 = trail:Clone()
	trail4.Parent = character
	local attachment6 = Instance.new("Attachment", character.LeftUpperLeg)
	attachment6.Name = "TrailAttachment4"
	local attachment7 = Instance.new("Attachment", character.LeftFoot)
	attachment7.Name = "TrailAttachment5"

	trail4.Attachment0 = attachment6
	trail4.Attachment1 = attachment7

	-- Trail 5
	local trail5 = trail:Clone()
	trail5.Parent = character
	local attachment8 = Instance.new("Attachment", character.RightUpperLeg)
	attachment6.Name = "TrailAttachment4"
	local attachment9 = Instance.new("Attachment", character.RightFoot)
	attachment7.Name = "TrailAttachment5"

	trail5.Attachment0 = attachment8
	trail5.Attachment1 = attachment9
end)

Script 2: Localscript inside StarterCharacterScripts

local player = game.Players.LocalPlayer
local character = player.Character or script.Parent
local humanoid = character.Humanoid
local remoteevent = game.ReplicatedStorage.RemoteEvent


while humanoid.WalkSpeed == 16 do
	print(humanoid.WalkSpeed)

	for i,v in pairs(character:GetChildren()) do
		if v:IsA("Trail") then
			v:Destroy()
		end
	end

	wait()
end


remoteevent:FireServer()

Script 3 : localscript in StarterCharacterScripts

local player = game.Players.LocalPlayer
local char = player.Character
local hum = char.Humanoid
local UserInputService = game:GetService("UserInputService")
local speed = game.ReplicatedStorage.Speed.Value


UserInputService.InputBegan:Connect(function(input, isTyping)
	if isTyping then return end
	if input.KeyCode == Enum.KeyCode.LeftShift then
		speed = true

		while speed == true do
			if hum.WalkSpeed == 250 then break end
			hum.WalkSpeed = hum.WalkSpeed + 1
			wait()
		end
	end
end)

UserInputService.InputEnded:Connect(function(input, isTyping)
	if isTyping then return end
	if input.KeyCode == Enum.KeyCode.LeftShift then
		speed = false
		repeat
			if speed == true then break end
			hum.WalkSpeed = hum.WalkSpeed - 1
			wait()
		until
		hum.WalkSpeed == 16
	end
end)

Script 4: Localscript in StarterCharacterScripts

local player = game.Players.LocalPlayer
local character = player.Character or script.Parent
local humanoid = character.Humanoid
local remoteevent = game.ReplicatedStorage.RemoteEvent

if humanoid.WalkSpeed == 60 then
	remoteevent:FireServer()
end

.