STEP
Wipe clean with a squeegee. (Multipane)
Pull the squeegee down each pane in a single stroke from top
to bottom. After each stroke, clean the blade with a rag so it
doesn't leave streaks. (If the squeegee squeaks a lot, add a bit
more soap to the water.) As above, remove any streaks on the
glass with a chamois, and dry the sill with a rag.
6
7
STEP
Get rid of stubborn spots.
Over time, hard-water runoff from masonry or rain falling through
metal window screens leaves stubborn mineral stains on glass
that normal washing can't erase. So after a regular cleaning, wet
the glass and gently scrub it either with fine 000 steel wool (if
the panes are small) or with Barkeeper's Friend, which contains
oxalic acid. (Other brands of powder may scratch the glass or fail
to remove stains.) Mix the powder into a paste on a wet towel,
rubs away the stains, then rinses and squeegees the glass twice
to remove the residue. Even with that treatment, the staining
generally comes back in about six months.
To get rid of stains for good, apply an application of 3 Star
Barrier Glass Surface Protectant, a clear polymer coating.
After the stains are gone, you just put the coating on
with a strip applicator and squeegee it off—super simple.
Protection against staining is permanent, as long as the
polymer is reapplied after each regular cleaning.
