Our condo has a 10 foot high, floor-to-ceiling windows the entire length of our unit, and the condo builder used cheap parts for the roller blinds that are installed in those windows. That, coupled with the fact that the previous tenants seemed to abuse the blinds left a few of them in need of repair and cleaning.
Rowan from Ultrasonic showed up with very little notice and within a half hour, fixed all of the suspect blinds and was very friendly and professional in doing so. To top it off, his prices were reasonable, and definitely worth having a professional deal with these nuisance blinds once and for all.