Clean everything out and get an ant specific pesticide.
They are too many of them, i used a air compressor + vaccum. But many of the ants are still inside. Im afraid to open my psu it might void a warranty. I got many dead ants on the circuit like its shocked by the electricity.
By the way, why they target my psu? + its very hot inside my psu because the fan is not spinning (RM750)