I have two china doll plants. For the second time only one is getting this white fugus on it. I put the plant in the sink and washed it with a little warm soapy water and with a soft brush, brushed it clean. It was ok for a couple of weeks. Then it came back. I took a closer look with a magnifying glass and saw these bugs coming out of this white fugus. The bugs where bigger than regular plant mites. The other china doll plant never got this fugus. What can I do? Is there a spray? Please help!

Sue