We are solely responsible for the fence that is the back of our garden, but the side of the garden for the neighbours on the other side. We replaced the whole fence about 7 years ago and then last year we treated the side facing us with a creosote subsitute.
We did think of letting the neighbours know at the time we did the treatment as there is no doubt some will have seeped through cracks and knots on to the side facing them. However they had thick bushes\trees all the way along so A: it really wouldn't have been visible and B: they physically wouldn't have been able to do that side anyway.
However today we've noticed that they have cut a lot of those bushes back and, without looking, I'm presuming that it will be a lot more visible and, if it were me, I'd now be thinking about doing something about it.
Sooooo... I was thinking about dropping round, explaining why we didn't say anything at the time but also saying we'd be happy if they wanted to treat\paint the side facing them if they wanted to (and equally as happy if they didn't) but please could they use the same stuff we used as otherwise the reverse will happen and our side of our fence will look shit.
I'm worried though that it could come across as either interfering, presumptuous, cheeky fuckerish or a combination of all three. It's altogether possible they may think they can paint that side of the fence without our permission anyway (which would be wrong, but I could understand why they might think that). We don't know them all that well, but they've always been nice when we've spoken and have always let the kids in to get the occasional ball that has gone over.
If you were them, what would you think?