Two bottles of 30ml in a package together with a microfiber cloth in standard size 18x18 cm.
This is how you do it:
Shower directly on the lenses you are going to clean, or moisten the microfiber cloth. Remember that the microfiber cloth must be cleaned regularly.
Always blow/brush away loose dust, grains of sand and the like before using the cleaning cloth and liquid.
ATTENTION! Never use a mitt, shirt sleeve, or other dirty material to clean your lenses.