till now i didn’t came across such type of command which do both the function i mean move as well as erase.. i will let you if i come across this… for temporary what you can do is as you move back send a hex code ofr space and again move back…
LCD_cmd(0x04);
LCD_write(0x20);
LCD_cmd(0x04);
do let us me know if you get any command for that….