\apps\design\frontend\default\default\layout\local.xmlWithin node:
<layout version="0.1.0">
<default>
<remove name="catalog.compare.sidebar"/>
<reference name="left">
Add following lines:
<remove name="cart_sidebar"></remove>VoilĂ !
<remove name="sale.reorder.sidebar"></remove>
<remove name="catalog.compare.sidebar"></remove>