green stuff on shower valve connections i put in..need a little help
renovating my downstairs bathroom and i put in the new shower valve. it's been a month and i'm getting around to putting in the shower and tub trim kit. i took a look through the hole at the valve and i noticed that green material has accumulated at all four connections where i sweated the copper pipes into the valve. is this a serious problem? what causes it? is it a water leak somehow? do i need to rip it out and have it redone?