After using your aluminum grinder or pollinator for a while, there will be some build-up of material that may cause the unit to work less effectively. Find a container with an airtight top. The container must be large enough to hold the parts of the grinder or pollinator. Fill the container with enough high % rubbing alcohol (isopropyl alcohol 90% or higher) to cover the parts you want to clean. Do not use plastic or PVC containers for this purpose. Plastic and PVC will release toxic chemicals when brought into contact with rubbing alcohol (isopropyl alcohol). Glass is probably the material for a container. Soak the parts in the alcohol for 5-10 minutes. Use a q-tip to clean any stubborn spots. If you have a pollinator, be gentle and use a toothbrush to clean the screen itself (if necessary).