You cannot clean an RPMB using standard software; you need specialized hardware programmers ("boxes") such as: Z3X Easy-Jtag Plus : A powerful tool for eMMC/NAND programming.

For further visual guidance, you can refer to community tutorials from experts like Pep Tech Solution USB Infotech on YouTube. Do you have the specific model number

(Do not run raw commands you don’t understand; incorrect ioctl use can brick hardware.)