I have recently gotten several house plants and I am completly ignorant of how to care for them. I have noticed in the last couple of days the plants appear to be very dusty. I have tried wiping them with my hand, but should I take a more direct approach and use a tool(sponge, dusting cloth) or something to help remove the dust. Please help I am very desparate here and I really want them to live a long time. Thanks!!