Hi I cleaned the bright green line of flux off the pipe in the airing cupboard, with a plastic pan scourer, but could not access the source of the flux leak in the attic (possibly the join) as there are other pipes in the way, plus cables, and I'm also worried i've knocked the earth bonding. Also, there is green flux on another pipe. The pipe in the attic that bled flux into the airinig cupboard is inaccessible to me. The plumber said that he is not going to look at all the joins to clean the flux off each one, as the loft is ten metres long with it being a big flat. Since noticing the flux last night, I no longer trust the plumber, I think he will fob me off. He left loads of mess up there too, bits of lagging etc, and dunno if he's used the right size lagging. Meanwhile, given the corrosion on the pipes in the pictures below, I am really worried as decent plumbers round here are all usually booked up and in the meantime a lot of damage could be done if the plumber was too lazy to clean all the flux off the pipes. Below are the pictures of the cleaned flux in the airing cupboard. Can you see the corrosion(lighter colour and green corrosion at teh bottom where i wiped some off with my hand in the small hours? The second pic is another pipe with flux on. The third pic has a red arrow indicating the pipe that was bleeding flux into the airing cupboard. I am worried as the plumber has refused to go over all the joins in the loft, and am worried that the flux will erode them if left. There is no way I can access them the loft is far too big and is unsafe as it is not boarded out. Sorry for the fresh post I just wanted you to know I have been pro active. Was I right in using a plastic pan scourer to clean off the flux, I forgot to dry the pipes though. Here are the pics, any help would be really appreciated. Please dont post just to tell me not to worry, I need to know if my pipes are going to be damaged, because I might have to enlist the help of another plumber. thanks. corrosion after wiping flux off with wet plastic pan scourer, while pipe was hot with heating on-note the green bit of corrosion at the bottom where I wiped it off with my hand 24 hrs ago, I cant get this off, and am worried it will cause a small leak. corrosion line from flux wiped from top of pipe as it leaves loft, you cannot see the green in the hole in the plasterboard on the photo but I tried to wash that off and just made the plasterboard soggy. Another newpipe with flux on join, you cannot see the green much on the photo there is much more in teh flesh Red arrow shows pipe that was bleeding flux, I cannot access it to clean flux off, worried what damage flux will do to pipe if not cleaned off Also, I tried to wipe the back of another pipe, that i could not see with a piece of kitchen roll and that has got green on but I could not see what I was doing because all the pipes are close together. If a small amount of time can do this, what will happen if the flux is not removed from the pipes? See corrosion in red circle. Also, worryingly, hes got flux on the plasterboard between the loft and the airing cupboard, i tried to wash it off but i've just wet the plasterboard. Thanks, sorry for the long post but ive been pro active in cleaning flux off pipe in airiing cupboard, just worrried about the rest of the joins on the pipes in the loft thanks I really appreciate any reassurance or any warnings so I can tell the plumber when he comes at the end of the week.