Letâs take for example a start up pressure washing business that specializes in house and deck cleaning. The obvious factors would be supplies, transportation, possibly rental space for the business or a payment on a loan for one or more vehicles.our $80 dollar an hour/ 40 hour a week paycheck equals $3200 per week in revenue. If you are billing customers for only $30 hours per week, your hourly fee needs to be $106 an hour. Now, you are in business! Determining how much to charge your customers may seem like a lot of work, and honestly, it is.