Faucett drips after shutoff

there is probably a shutoff on the rough-in valve in the wall. Sometimes the seal in that comes apart and blocks the water. Get new stem for valve. Unscrew the nut, replace stem, tighten nut. Clean inside valve before u put new one in.

it may have build up from water and soap on white viniger will clean all the hard ater build up off in order to tiurn it

They are bad about leaking,you prob. need to replace the cartridge with new one. the seals in them get dry and shrink of they have been sitting in the box for a long time on the shelf or in a warehouse. you never know how long ago they were built and just sitting.

Try removing the handle, then the face plate. With a flashlight handy, check inside the wall around the valve to see if you see any leaks. Then, try the valve by pulling the stem (may need a plier to grab this). Keep checking inside the wall. Next, try the shower, and again watch in the hole you have. You may find that the connection(s) to the valve is/are leaking, particularly at the top of the valve where the shower pipe heads up the wall. Or, it may be that the shower head's arm is leaking somewhere above. If you only see water dripping down from above, try the flashlight with a small make-up mirror to see if you can see where it's coming from. Sometimes the pressure in the shower head builds up from the flow restrictor, or the head's spray holes may need cleaning out (try soaking the head in a solution of CLR [stands for Calcium, Lime, Rust] available at most home improvement/ hardware stores). Sometimes the shower arm (the bent 1/2" diameter pipe that the shower head mounts to) isn't fastened in tightly enough. A good trick to help here is to wrap the threads with teflon tape, then apply teflon paste also. Wrap the tape clockwise around the threads so that it doesn't unwrap when you screw the pipe back into the fitting in the wall. Also, make sure the threads in the fitting in the wall are cleaned out, and don't let any debris contaminate the new teflon paste as you slip it back through the hole in the wall. If you find that the pipe out of the top of the valve is leaking, I recommend you call the plumber. He/she can likely fix it without taking the wall apart.

Open the cover plate up at the faucett and replace the faucetts cartrage and rubbers, sound like somting in that region has parished
Hope that is the problem

It can be repaired without taking entire valve out of wall. First shut water off and remove handle. Next you will see a collar that will screw off to remove the cartridge below is a link for a single handle moen faucet. Check it out to get an idea. If you know your model you can research on line ,but they are close enough to give you an idea.
Once appart replace washers or o -ring's. Pay attention to how you take it appart for easy reinstallation.

http://www.moen.com/shared/pdf/t2703pt.pdf This link is aparts breakdown of a single handle faucet.

http://www.moen.com/shared/pdf/t2703pt.pdf This site is installation instructions.

http://www.efaucets.com/detail.asp?Product_Id=T2703 This site you can enter you faucet model to retrive information.

There is normally a plastic washer at the end of the valve stem which you turn to allow the water to flow and to stop the flow. It sounds like this washer has either deteriorated or been damaged by over-tightening. You will need to remove the stem and replace this washer. It is normally held in place with a screw.

You will need to remove the on-off handle and probably a stem cover to access the flats on the stem where you can place a wrench. These flats will likely be recessed into the shower wall; therefore, it will likely require a deep socket to reach them. Most hardware stores will have the sockets needed to remove and replace these stems.

Of course, make sure that the main house shutoff valve is closed before you start to do this.

Go to home Depot or loew and buy the seat replacement kit for your model of faucett. Your going to have to break out the tools (Philipps Screwdriver and a larger adjustable wrench) The remove the shower knob cover with a knife to access the mounting screw. Remove the screw and then the knob. (STOP!) Go turn off the water for the residence now! Then come back and remove the nut holding the faucett in place. The whole assy will with a little effort will come straigth out at you. Moen isnotorious for having to remove a plate from the bottom of the valve. NOTE the position of that plate and then remove it. Remove all of the seat seals one at a time and replace them with the new ones you purchased. Reinstall the NEW lower plate in the same position you removed the old one. Reinsert the assy back into the valve body. Tighten the retaining nut. Reinstall knob and secure with screw. Replace knob cover. Turn on the water NOW. Enjoy the non-leaking faucett.

First determind what side is dripping(hot/cold) then turn off water to entire house unless you have separate shutoff for shower behind wall. take a screw driver remove handle then use channel lock pliers to remove stem on the bottom side of the stem there will be a screw with a rubber washer on it you must remove the screw and replace the washer them re assemble Oh go to home depot and buy a the assorted pack of washer for faucets and stems find one that fits the pack cost about 4.99 best to change both rubber seal washer on hot and cold sinc e you have the water off

I would unscrew shower head pipe and either pipe dope it or tefilon the threads and then reinstall it. I would also take the handle(s) rosettes off and look for a leak from there with a flashlight, while shower is on. I believe the most comon leak for walk in showers are the door seals. Are you sure it is not coming out from under the door? Another test that yuo may want to preform is to Stopper the drain, fill the shower pan with water and watch for bubbles, or look for leaks from below.