Welcome to Goy Julie----- Would it be possible to run polythene along the bottom of the fence to guide the water to where you can safely dispose of it. Is there enough room to put in a channel or cement bricks along the edge nearest to her. Pressure hosing is the best way to get rid of growth on sunless paths. The alternative is a hard scrubbing brush and elbow grease but she might still feel it is necessary to complain because of some other reason. Maybe you could invite her round to see the problem and ask her advice on how else it can be tackled. Sorry I'm not being very helpful.

Thanks Scotsgran - unfortunately despite so much effort to be neighbourly (handmade chocolates, being a key holder when she used to go on holiday etc etc - she is quite an unpleasant character - doesnt speak to anyone in the area - we think she may be suffering from some form of mental health issue so no possibility to sort things out there - so hence why I am seeking an alternative solution to try and avoid any confrontation like 2 years ago when she was screaming at me for a tiny trickle of dirty water going under the fence). Whatever I do will be wrong but I was wondering if jeyes Fluid would do the trick - I think I could rinse off with pressure hose but cant hang around to create a wave of water - what do you think?

It could be even worse because of the smell - unless she's lost her sense of smell of course...

You could try spraying with one of the path clear products. I tried it on one path. It turned the algae black and heavy rain washed a lot of it off.

Have you thought of pressure washing it during a really heavy downpour when she might not notice the extra water?

Is her path in need of a wash too - you might try asking if she'd like you do do hers at the same time (live in hope, lol)

Thanks Steragram - Good point about the smell - the path runs next to her kitchen door which she always keeps open and never uses her front door - she has people round to do everything for her constantly - there is never a weed or a mark on her house - Im a working mum of three and we do all our own diy and gardening - I never know when she will be getting a team round to do her work but to be honest it wouldnt make a difference - she wouldnt even let us drill a screw into the fence post to fit a side gate to stop our toddler from running into the road a few years ago. I offered to clear up any water overspill for her and she slammed the door in my face - luckily we have a great relationship with every other neighbour - she doesnt speak to anyone. I tried the patio cleaner last year and it didnt work. As she never goes away for more than an hour its impossible to even get it done while she is out. If I use bleach she will complain her cat might burn its paws, if I pressure hose the water will be dirty and the noise will wake her up from an afternoon nap - was just wondering if there could be a better solution. I must sound like a really miserable neighbour - Im not - she hasnt spoken politely to anyone who has lived in the neighbourhood for 30 years.

Oh dear. What a sad old lady. It can't make her very happy being like that. Shame she spreads her misery around though. Looks like a straight choice between pressure washing and annnoying her or having a green path. Can't thinkof any other solution- why not try Scotsgran's idea - if you stuff enough of whatever you happen to have under the fence it might deflect most of it and she'll just have to put up with the noise - its not deafening after all. Old rags plus plastic might help.There's a difference between bending over backwards to be compliant and letting somebody run your life...

my mum had a neighbour like that. she used to hard brush her path during the rain. I think others thought she was mad but it prevented the neighbour complaining.

again not much help.

weak bleach or salt may do it.
try brushing the path with coarse sand/grit and a stiff brush.

I had a neighbour (now deceased) like that. His increasing dementia meant there was nothing I could do right. When I saw him moving some heavy slabs and offered to help I was in the wrong for inferring he was incapable.

In other words, there's nothing you can do that won't get her upset.

I'd offer her a choice. She can tell you when she has someone coming round to do her garden and you'll do the patio before they arrive and can clear up any mess or you'll do it when it suits you and not bother what she thinks.

I know you want a win win solution but it could be that the problem on your path is coming from her higher ground. Run off from there may be the problem. A word with your local building control department might offer some sort of solution that she would find acceptable. Does your concrete abut the fence. If so would it be possible to cut 6" of it away, dig out the soil underneath the channel and fill it with drainage stones etc. Next time she complains write her a short note explaining that finding a solution is in both your and her best interests. The problems you have with neighbours have to be detailed on the information given to a prospective buyer.

Like SBG has said, so, some wet weather gear on and pressure wash it during a rainy day. She won’t know what to shake her fist at first, the rain clouds or you.

Scotsgran makes very good points, although I suspect that trying to communicate in any way with this neighbour is going to be a waste of effort. I was just going to suggest Algon. It always works a treat for me. :) I certainly wouldn't worry about the smell....and as for the cat...well, its her responsiblity not yours. If you do it on a good mild breezy day, it will be dry in 15 minutes and in a few days all the algae will be gone. No need to wash or anything.

I had never heard of Algon so googled it. That sounds like an excellent idea, its widely available and can be bought in small quantities and pet safe.

I think that your neighbour has a double next door to me.

Ignore her and pressure wash away, remembering that some people are miserable, ungrateful, grumpy neighbours - no matter how nice you are to them! You could bake-make-and-take all you like, hold keys and take in parcels until the moon turns red; she will never change.

Enjoy your garden and do what you need to do to make it a pleasurable place for you.

I have the same problem with the green stuff all over my cemented concreted space, so washed and rinsed my two-level patio with a hard bristle broom and Doff Patio Cleaner, today.

I shall try this Algon as well. Thank you.

I use Algon in my garden and it is very effective, slight smell but not much. Brilliant solution to your problem. Use with either a watering can or sprayer. Available from most garden centres.