* User who does not smoke and has no pets - Clean the computer every five months.
* 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.
* School computers with pre-teen users - Clean the computer every month. In some cases, this may need to be weekly or daily