Sieves should be cleaned after each analysis and replaced in
their storage containers. Most of the 'near mesh size' particles
which block the apertures can usually be removed by inverting the
sieve and gently tapping the frame. If this fails, the underside of
the mesh may be stroked gently with an Endecotts sieve brush
specially designed for use on test sieves with
apertures over 1 mm
For sieves with small apertures and almost any other
application the most efficacious method is the use of an ultrasonic
cleaner.