I used sink plungers in toilets pretty much my whole life until i scrolled across a similar diagram one day and discovered the truth.
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Most plungers are both. Pull down the cone for the commode or push it up inside for the sink.
What kind of maniac uses it in a sink after using it in a toilet?
Clean it first. Then clean the sink after using soiled plumbing tools.
Just buy a new sink after you unclogged it.
y’all motherfluffers never heard of bleach