Using this reusable cloth vacuum bag is a breeze. First, make sure your vacuum cleaner is turned off and unplugged. Then, open the bag compartment of your Cleanstar Butler VBUT, Electrolux Z950, or Z951. Remove the old bag and insert this new one, making sure the plastic fitting is properly seated. When the bag is full, simply take it out, empty the dust, and give it a good shake. You can also wash it gently by hand with mild detergent and let it dry completely before using it again. Remember to check the bag regularly for any signs of wear and tear. If you notice any holes or damage, it's time to replace the bag. This will ensure your vacuum cleaner keeps working at its best and maintains good air quality in your home.