I have just moved into a new house with timber windows with 8 panes of about 170x240 in each. The previous owner wasnt much for cleaning so there is mould growth on the sills and timber etc. Also the windows appear to be sealed with a black flexible sealant around their edges and used to hold them in their frames which is still very flexible and is 'running' down the windows.
Does anyone know if this is OK or commmon and any ideas on fixing them and what materials / sealants should be used? With 132 panes to do i hope its simple!!