Either have a sim clean it up or press Control-Shift-C, then type moveObjects on, then you can go to buy or build mode and select the rubbish and delete it like you would anything else.
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Go to - My Documents -Ea Games -The Sims 2 Delete the entire The Sims 2 folder. Then go to your game. The game will automatically create a new The Sims 2 folder. If you have custom content installed and don't want to delete it, before you delete The Sims 2 folder, move the Downloads folder to Desktop, delete The Sims 2 folder, go into your game, then exit out of it and move the Downloads folder back into The Sims 2 folder.
press delete account,dude.
Delete the tombstone.
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