They make kits designed to carry in the field made my PECA
Cleaning your sight:
Scope exterior -
Clean the riflescope body with a clean cloth lightly moistened with clean
water. DO NOT use strong solvents. In the event of submersion in mud, sand or salt water
flush the outside of the scope with clean water to remove encrusted material or salt. If the
sight came with screw on turrets, install them before flushing. Wipe outside with soft clean
cloth.
Lenses –
With the lenses facing down allow the debris to fall away from the surface, remove
loose dirt and dust with compressed air and or a lens brush. If there is grit stuck to the lens
that won’t come off with the compressed air or a brush, flushing the surface with distilled
water will prevent that grit from being rubbed into the glass by the cleaning swabs.
Using a soft clean lint free cotton swab or lens cleaning cloth and lens cleaning fluid applied
to the swab, clean the lens starting in the centre, working to the outside. Make only one pass
in the corner where the glass meets metal. Once you reach the corners of the lenses. Do not
re-use that swab as it will often contain abrasive grit. Repeat process until the lens is clean.
Use a small amount of cleaning solvent for the last pass to prevent streaks.
Replace the lens caps on your scope
to prevent the “blooming” from being accidentally removed