I've serviced similar cases like this before. The front panel most likely can take out one, if not its pretty impossible to even install the fan haha.
On "cheaper" cases like this, its usually held in place by screws while "higher end" cases have snap on clips.
If you're around east/Tampines, I can help you clean your entire rig for a meal and also teach you how to maintain it yourself in the future
Also, although its quite popular amongst some of our hardware guys here to use air blowers to "remove dust", I personally dont recommend it because a lot of that dust will still linger in your case and onto other parts after blowing, which makes it even worse IMO, and then some of them actually do blowing and then vacuuming, which vacuuming is
said to introduce static which might either kill your components or leave them half-dead if it comes into contact. There's one camp that says vacuuming is safe and has been doing it for years while there's another camp that says its bad and all and stay away from it.
Personally I'm the latter camp so what I usually do is
1)Take out all the heatsinks(CPU/GPU) and give them a shower and dry them
2)Use paintbrush to dust away anything thats on motherboard/GPU PCB
3)If case has thick pads of "dust", clean entire case with wet tissue, if is just hairy dust sweep with paintbrush and then just run over everything with wet tissue to finish off
4)Assemble things back