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You're incorrect. Read this. Pesky Problems for Lunar Reflectors - Sky & Telescope
I read the entire article and found this tidbit further in...."But, something else is causing weak returns, and the drop off gets particularly bad (by another factor of 10) around a full Moon. In icarus, Murphy and his team surmised that is due to distortion in the optics due to heat from the Sun."
"One way to confirm this hypothesis would be to monitor the reflectors' performance during a total lunar eclipse."
"Fortunately, clear skies prevailed during the total lunar eclipse of December 21, 2010, and for 5 1/2 hours off three Apollo reflector arrays.....sure enough the efficiency immediately improved as Murphy and others reported in the March 1st issue of icarus."
So, dust was not the main problem with the reflectors by your own link to this article.
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