We bought a 250 yr old cottage last year. Cottage was very damp and we were told to back off and lime plaster internally and then 're do the render externally. Inside has been done. We did paint quite early as we had to move in using earthborn clay paint. Recently we have noticed grease marks coming through the paint. Salt deposits seem to also make the paint start to fur up in places which I have been brushing off. What can we do about the grease marks? I am assuming it's from the fat in the lime? It's been a year now since it was done. Any advice? Also we need to start looking at getting external concrete render hacked off and then lime rendered or glastered? Anyone do this in Berkshire area?