Pipe-cleaner
This
is
available
from
tobacco
shops
.
Ensure
that
the
bristles
of
the
pipe-cleaner
are
soft,
so
that
they
do
not
scratch
your
device
during
cleaning.
Caution
Store
your
pipe-cleaners
carefully
and
never
reuse
them
as
dust
and
dirt
from
the
air
or
from
previous
cleaning
can
scratch
and
dirty
your
optical
device
.
Compressed
Air
This
is
available
from
laboratory
suppliers
.
It
is
essential
that
your
compressed
air
is
free
of
dust,
water
and
oil.
Only
use
clean,
dry
air
.
If
you
do
not,
it
can
lead
to
lmy
deposits
or
scratches
.
When
using
compressed
air
from
a
can,
Hold
the
can
upright.
A
slant
can
cause
propellant
to
escape
with
the
compressed
air
and
dirty
your
optical
device
.
Spray
the
rst
couple
of
seconds
into
the
air
,
as
the
rst
stream
of
compressed
air
can
contain
condensation
or
propellant.
Any
condensation
produces
a
lmy
deposit.
If
you
are
using
compressed
air
from
a
can,
you
should
select
one
with
a
CFC-free
propellant,
for
the
sake
of
the
environment.
E-2
Cleaning
Procedures