You have a mixture of formatting. The fastest way to remove the local formatting and style everything is by using some keyboard commands in this order
Ctrl-A will select everything in the document
Ctrl-Space and Ctrl-Q will remove all the local font and paragraph settings
Ctrl-Shift-N will apply the Normal style

Once you clean those attributes, the rest of the cleanup should be easier

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Andrew Lockton
Chrysalis Design, Melbourne Australia