A small tip for getting to the coolant drains on each side of the block. A small 1/4" ratchet with a deep 10mm socket is the perfect size to get behind the lines and crap in the way, but be far enough away from the block to turn the ratchet.
for the search:
coolant flush
block drain
lx470
100 series
2uz-fe
for the search:
coolant flush
block drain
lx470
100 series
2uz-fe