cheers Darran,
I will give it a miss then i think, I have been cleaning them personally for nearly 6 months and the guy i bought the work off has been doing them for 3 years plus, so they obviously aren't bothered. Some of the glass in the buildings has totally blown, i have been told by the cleaners that they have complained to the landlord about it, So if anything is said i will tell them that its gone too far and needs replacing. I have done the insides for the first time last week and it highlighted how bad they were, I was hoping to improve them and bump a slight increase onto the price this time. but it doesn't sound worth it. thank you again for your advice