Not #CLEAR. Try V1=0, etc.
#CLEAR probably removes/deallocates the variable from memory and frees up a memory slot.

edit:
EXAMPLE:
#CLEAR This zeroes all macro variables
# CLEAR V1 This line will zero only variable
# CLEAR V1-V20 This line will zero variable
# CLEAR V3-V7,V15,V30,V45-V60 This line
then V15 and V30, then V45 through V60