We have these spring loaded push button sink plugs in our house, and from time to time they stick in the closed position so you can't drain the sink.
This is usually due to a build up of soap scum, mould etc (yum) so this is how you get them to work again --with the added bonus of cleaning the crap off of them, so they are more hygenic.
Sorry some of the pics are a little blurry but I was trying to get close ups while doing the job and holding the camera -- I need a slave to take the pics!!
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Step 1: Materials and Tools
A pair of pliers
Steel Wool or Wire Brush
Silicon Spray or WD40
Step 2: Removing the Plug
Firstly you have to get the plug bit out (the shiny chromed bit)
If you can get the plug to open (ie you are doing this before it is jammed in as preventative maintenance) you can grip the outside with your fingers or CAREFULLY with pliers and rotate it to come off
If the plug is jammed shut the push down on the top surface while trying to rotate anticlockwise, they will usually come apart pretty easily, for extra grip try wearing a rubber glove. (On your hand - silly!!)
Step 3: Removing the Stem
Use the pliers to CAREFULLY turn the stem anticlockwise and remove, sometimes it will come out in one piece still attached to the plug, This is a BONUS!!
Step 4: Clean
Clean as thoroughly as possible using wire wool, wire brush etc
I also sprayed with mould killer, washed the whole thing in very hot water and then sprayed with silicon spray.
Work the "action" several times (open and close) to ensure it is free to move
If it is still a bit sticky then there is a small locating screw on the side, which may have worn a groove or lip internally, try slackening this 1/4 turn.
Step 5: Reassemble
As they say in the Haynes Manuals Reassembly is the reverse of dismantling --easy enough, don't overtighten anything just do it up and "give it a nip" Remember these bits are usually brass and not got a huge amount of strength.
Operate it a few times to make sure it functions
While you're at the sink it is probably a good time to clean the U-Bend or P-Trap depending which you have.
I will cover this in a later I'ble
Thanks for reading