I used this product mainly for cleaning the switchboard's dirt and dust. When I ordered the item, I was unsure Vooki product is useful to clean heavy and deep dirt. But my thought was changed, the Vooki is such a good and very useful product. Just 3-4 sprays into the switchboards and wipe it microfiber cotton cloth to get the best results. I strongly this product. The only problem I faced was the delivery agent. The delivery agent was DTDC. Fcuking delivery system.