Thanks guys for the responses. I'll look into the MFT cameras, hadn't even considered them. Definitely appealing that I can get to the sensor and use air to blow off dust, etc. I'm done with closed systems. I tried putting the camera on a washing machine briefly to see if it'd shake the dust lose (it didn't) then with the camera on and zoomed I used the air blower hoping to knock off the dust. Now it's worse. =/ As I bought it in June 2015 it should be under warranty, going to send it off to Sony hopefully and get it cleaned.
Do that first. That should at the very least keep it clean for a while.