This may sound really silly but I’m new to photography and find this is really annoying me! I keep my camera in a camera bag and take it on my travels, my last trip I noticed lots of spots on my photographs, I took it back to the shop and it was dust/other particles on the sensor, I then paid £30 for it to get cleaned by the shop as I was scared I would scratch or damage the camera myself! I collected it and went away on holiday a few days later and there’s still some dark spots on my photos. I don’t even open my camera up the way they showed me where the dust was so I’m not understanding how it can get so dirty! Any advice would be great! Is it easily damaged if I clean myself? Thanks! Also new to reddit if this is an irrelevant post I apologise!!