Disclosed are cleaning sheets having at least two regions, where the regions are distinguished by basis weight. In particular, the cleaning sheet comprises one or more high basis weight regions having a basis weight of from about 30 to about 120 g/m2 and one or more low basis weight regions, wherein...http://www.google.com.au/patents/US6645604?utm_source=gb-gplus-sharePatent US6645604 - Structures useful as cleaning sheets
