The following suggestions, which refer to the materials used in the cleanroom, should be considered:

• Cleanroom wipers that have low concentration of contamination should be used. The exact type of wiper that is selected will depend on the financial budget and what is being produced in the cleanroom. It will also be necessary to decide how often a wipe should be used before being discarded.
• The movement of materials between the inside and outside of a cleanroom should be minimised. Every time a product moves out of the cleanroom there is a high possibility of it being contaminated in the less-clean area, and this contamination being brought back when it re-enters. It is best to store products in a suitable clean area within the cleanroom, or in an adjoining clean area.
• It is normal to find that great care has been taken to ensure that a product is not contaminated during its manipulation stages. However, after that, it can often be forgotten and left out in the cleanroom to gather dust. Products that are susceptible to contamination should therefore be kept in closed cabinets, containers, unidirectional flow benches, or isolators. If the airflow in the cleanroom is unidirectional, storage racks of the type that allow air to flow through are a good choice. Materials should not be left standing on the floor.
• Waste material should be collected frequently into easily identified containers and removed frequently from the cleanroom.
• Cleanrooms should be correctly cleaned (and disinfected if required)
• The cleanroom must be kept neat and tidy. If it is not tidy, it cannot be kept clean.