Nice simile - I like it.
To extend it a bit further and slightly tweak your definitions, I think that people tend to assume that a clean window, devoid of the dirt (of defilements) is the best thing to look through, when in fact they would get a better view if the window (of fabrication) and frame (of reference) themselves were removed.
Many people may be happy to clean the windows for a better view, but not so many prepared to investigate the role of the glass itself in the distortion, and remove the window and frame itself. Many are satisfied with clean windows.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine