Sea Buff Dive Mask Pre-Cleaner is Specially Formulated Dive Mask Pre-Cleaner and Slate Cleaner. Sea Buff carefully removes Residue left on New Dive Mask Lenses by the Manufacturing Process and prepares the surface for the first application of Sea Drops or Sea Gold Anti-Fog Formulas. Failure to use a Pre-Cleaner on a New Mask will not allow Mask De-fogging Solutions to properly keep a mask Clear of Fogging when diving. Sea Buff also removes other Residue Accumulated on Masks while diving or During Storage. Sea Buff is also ideal for Cleaning Slates without Harming or Scratching your Slate. Mcnett Sea Buff comes in a convenient 1-1/4 oz (37 ml) Squeeze Applicator.