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User who does not smoke and has pets - Clean the computer every four months. User who smokes but has no pets - Clean the computer every three months. User who smokes and has pets - Clean the computer every two months. Business with clean office environment - Clean the computers every five months. Business with clean office environment, however multiple users use each computer - Clean the computer every three months. Business that is a factory environment or allows smoking - Clean the computer every two months. School computers with young adult users - Clean the computer every three months. User who does not smoke and has no pets - Clean the computer every five months. School computers with pre-teen users - Clean the computer every month. In some cases this may need to be weekly or daily. 6

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