Start. Roll of papertowels was left to show near true white.

The above pics are compressed. This is being rectified ASAP. Sorry!

Almost 100 % removed in 2 passes. On Left Side = on 50% of the glass)

Stunning clarity. Close visual inspection shows a min. of 97% correction.

Not all windows can be cleaned this well. This is a 5 yr old shower, this was about 3 years of hard water residue.

Exterior glass, either plain or tempered are exposed to heat and cold extremes.
No guarantee is made to correct all types and situations of affected glass.

To be clear... Correct it before too much time has gone by, because ALL glass is actually quite porous.

It costs far less to restore glass panels than it costs to replace.

Apollo Window Cleaning