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Plunge water first before removing the trap
Before you remove a sink trap, give the drain a few plunges
with a toilet plunger. This will push most of the water out of
the trap, lessening the mess when you pull the trap. If you
have a double sink, be sure to plug the other drain to
contain the air pressure. If the strainer isn't a screw-down
style, you'll have to hold it down while you plunge the drain.