This weekend when I was cleaning up, I stripped the sheets on my bed to let the mattress "air out" like I usually. When the weather is nice outside, I always open the windows, so that fresh air can circulate around the house. Well, I noticed a piece of lint on my mattress and I reached across on the other side to get it off but my hand fell kinda hard on the mattress. When that happened, I noticed that a white "cloud" of "something" rise up. I then slapped the mattress to see if my eyes were playing tricks on me. Well, the weren't. It appears that my pillowtop mattress is "dusty". The only thing that I can think of that would have caused this is from leaving the windows in the house open and dust coming in from outside and getting in and settling into the mattress top. Now, I'm stuck with not knowing how to clean the mattress. I called the store that I bought the mattress from and they really didn't know. The lady suggested that I "unzip" the mattress top cover and wash it in the washing machine. Well, I don't have a mattress cover to unzip. I have a king size pillowtop mattress that is too heavy to move by 1 person. It's one of those mattresses that you can't flip on the other side. So, my question is, can anyone tell me how to clean this mattress to rid it of the dust? I thought about a wet/dry vac but I don't want to damage the mattress. Any suggestions would be greatly appreciated.