Try power cleaning, then wait a day. If no success, perform a power cleaning again. When switching off the power source, always shut down the unit first with the off mode, then switch it off. If you observe this, no blockages will occur.

This is a residual ink container and has nothing to do with the blockage. In case of clogging, it is recommended to clean the printer head, possibly a power cleaning if the printer has it.

Rather not. The print head, on the other hand, is already cleaned if it is not too dry.