Great minds an' that, John!
I gave our GH a serious wash yesterday, and it really does look like new now! I had a lucky escape when I had to remember in the nick of time that the detergent has ammonia in it, and if I'd done the inside, that would have been fatal for everything, as I found out one year with using too much 6X liquid fertiliser, and lost the lot!
New staging is going in as well, as since we took out the fruit frame outside, we have several aluminium tube poles going spare, and I've found the company who makes the joints, which are just strong plastic inserts!
And it's going to rain all day, so I can make the wooden slats for the staging shelves!
Can't wait...