Looking at the scene I think that another reason why you may have had sensor problems is the climate that you are operating your camera in.
Tropical or subtropical climate is very bad for sensors when you go in an out of air conditioned areas.
It is impossible to avoid that a layer of condensation forms on all glass surfaces, which includes the sensor.
Of course, this is the moment in which you may be prone to cause particles to stick to the sensor if you don’t wait for the condensation to disappear.
I have had these conditions in Cuba and the Dominican Republic so I am assuming that you might have encountered similar situations.
This are probably so big particles to be visible with the naked eye . I have bought a magnifier lens with a ring of leds to inspect the sensor after having had several bad experiences.
Of course you can first start by blowing clean air (don’t use a spray canister by all means they often contain droplets which will soil the sensor) although most of the times this is useless.
After that you go to a wet clear or a gel clean.
When cleaning the sensor remember than NOT all products are equally recommended for Fuji sensors.
Rather than do it yourself, have the shop do this for you. The potential for causing havoc is very high if you don’t know what you are doing.
Fortunately my shop does this for free as a complimentary service
