I had a window replaced last April with a customised double-glazed, UPVC, designer glass patio door, leading onto a small patio area. There were immediate problems with the fitting which were sorted by another joiner, but now I notice the inside of the glass is very dirty. It's in full sun and weather, and very unsightly. What should I do?

Kate, October 2011

if it is in between the glass you do need a new unit if pretty new get on to the supplier of door and they will replace it .its not their fault its the glass companys and should be free of charge

gavin harris, December 2011

Get back to supplier it should be under warrenty

Len, November 2011