Fully invisible part remover

local function isCharacterOrNPC(obj)
    local model = obj:FindFirstAncestorOfClass("Model")
    return model and model:FindFirstChildOfClass("Humanoid")
end

local function checkPart(obj)
    if obj:IsA("BasePart") and obj.Transparency == 1 and not isCharacterOrNPC(obj) then
        obj:Destroy()
    end
end

for _, obj in ipairs(workspace:GetDescendants()) do
    checkPart(obj)
end

workspace.DescendantAdded:Connect(checkPart)