They are made for cleaning electronic devices
You could also use an air compressor which is cheaper in the long run.
Is using a can 100% safe though?Because i am very interested in this also in terms of future maintenance?
Just be sure not to hold it on for too long, or too close so condensation forms on the components.
once a year should be sufficient, if you have the rig on a hard floor or anywhere more dusty than average maybe 6 monthly.