I have two of these portable LP heaters. The buddy and the big buddy. Both of them have been great for the last couple years. I pulled them out of storage last week and was surprised that neither one of them would work. Here is the fix for a clogged up Mr Heater: https://youtu.be/L5UNAvPWXNE
I followed the instructions in the video and now they are both running like new. I did not use the computer dusting thing, I just blew it out with my air compressor and a small piece of hose. This is the first time I've had to do any maintenance on these things and they get used HEAVILY at my house all winter.