Need to deal with a blocked sink? If you don’t mind getting your hands a little dirty, some petroleum jelly can increase the suction power of your plunger.
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All you have to do is smear a layer of vaseline or petroleum jelly all the way around the ring on the end of the plunger. The jelly will help the rubber form a tighter seal around the drain.
15 Super-Practical Uses for Petroleum Jelly [WonderHowTo]