Hey guys, just wondering, is there any kind of association or group that recommends that a homeowner get their windows cleaned 2-4 times a year? Or is this just an accepted norm, just wondering for credibility purposes, had a customer ask me about this and I honestly didn't know? I just told them it is kind of the accepted norm from everything that I've read.
from Window Cleaning Resource http://ift.tt/1jewg9V
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