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Hi. Ohhhh, this is a bad situation, I've been in this situation many times and always got help from a site https://drainexpress.ca/professional-drain-installation-services-in-toronto-and-gta/ that has specific instructions on what to do when the sink is clogged and more. If you have this situation and can't do anything then the guys on this site can come to you considering you live in Canada.