You can try to make the wipeout mask manually - draw a 2D solid, color it to the color "255" and in the plot style table set this color to Screening=0% (Dither=off, Grayscale=off). Now make sure that this mask is placed under the text you want to clean up - either use Draworder or place the text to the end of the drawing database - e.g. with the macro:

 

^C^C_select;_auto;\_copy;_p;;0,0;@;_erase;_p;;