DH has somehow managed to get blue biro ink smeared all over the dark brown leather sofa (no idea how this has happened and worryingly neither of us have found the culprit pen as of yet confused) - it looks a right mess. Google has had me trying the following remedies - nail varnish remover (started taking off the leather), baby wipes, milk, kitchen cleaner - all have very slightly faded the pen however it is still very much there....any more suggestions please?!