5. Liquids should not be forcibly expelled from pipettes. 6. Mark-to-mark pipettes are preferable to other types as they do not require expulsion of the last drop 7. Contaminated pipettes should be completely submerged in a suitable disinfectant contained in an unbreakable container. They should be left in the disinfectant for the appropriate length of time before disposal 8. a discard container for pipettes should be placed within the biological safety cabinet, not outside it5. Liquids should not be forcibly expelled from pipettes. 6. Mark-to-mark pipettes are preferable to other types as they do not require expulsion of the last drop. 7. Contaminated pipettes should be completely submerged in a suitable disinfectant contained in an unbreakable container. They should be left in the disinfectant for the appropriate length of time before disposal. 8. A discard container for pipettes should be placed within the biological safety cabinet, not outside it