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How to CLEAN your 3M RESPIRATORS?
This is a compendium of suggestions from 3M company:

CLEANING recommended after each
use. 3M™ Respirator Cleaning Wipes
504 may be used as an interim method
in the cleaning schedule for individually
assigned respirators, but this
should not be the only method in place.
During fit testing, these wipes may also
be used to clean masks between employees
being tested. However, respirators
must be thoroughly cleaned at
the end of each day, using these procedures:

1. Remove cartridges and filters.

2. Clean facepiece (excluding filters)
by immersing in warm cleaning
solution, the water temperature
should not exceed 50º C, and scrub
with soft brush until clean. Add
neutral detergent if necessary. Do
not use cleaners containing lanolin
or other oils.

3. Disinfect the facepiece by soaking
in a solution of quaternary ammonia
disinfectant or dilute sodium hypochlorite
(30 mL household bleach
in 7.5 L of water), or another suitable
disinfectant.

4. Rinse in fresh, warm water and air
dry in a clean non-contaminated
area.

5. Inspect the respirator components
prior to reassembly. A respirator
with any damaged or deteriorated
components must be repaired or
discarded.

6. Store the clean respirator away
from contaminated areas when not
in use.

NOTE: The above information is also
outlined in the users instructions. Additionally,
see specific product user instructions
packaged with each respirator
facepiece for additional information.

Reference: Peter Knott, Terry Gorman
Senior Occupational Hygienists
3M Australia