What's behind the wall Mr Vine eyes? A stalactite formation sounds like a damp drip to me, is there anything on top the wall or behind it that could be causing such a stain? Unless you can ascertain the cause, you might find it constantly reappearing. Personally I wouldn't use a power washer, as the others have said they do make an awful mess.
I think there's some ivy left over that had pushed its way between two of the concrete slabs that are like the caps along the top of the wall. I suspect it's th water dripping down through this gap (although there are other gaps on top of the wall but not making a mess) I'll need to get in there and pull out any organic matter left over from the ivy.
IMHO ,if you use a pressure washer properly, you don't have to make a mess. It just takes a bit of practice and a bit of patience.
Or use the patio cleaner attachment. It works just as well on walls as it does in the patio but it's just a bit more awkward. Fine for small areas though.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
IMHO ,if you use a pressure washer properly, you don't have to make a mess. It just takes a bit of practice and a bit of patience.
Or use the patio cleaner attachment. It works just as well on walls as it does in the patio but it's just a bit more awkward. Fine for small areas though.
I think the trouble is that folk start off far too close to what they're cleaning then work backwards , by which time they've already made the mess. Only get as close as you need to , to clean it, not blast everything to smithereens.
IMHO ,if you use a pressure washer properly, you don't have to make a mess. It just takes a bit of practice and a bit of patience.
Or use the patio cleaner attachment. It works just as well on walls as it does in the patio but it's just a bit more awkward. Fine for small areas though.
I think the trouble is that folk start off far too close to what they're cleaning then work backwards , by which time they've already made the mess. Only get as close as you need to , to clean it, not blast everything to smithereens.
I agree Hostafan1. The temptation is to get in close, which results in a lot of overspray, crud flying everywhere, and a lot of blowback at the user if they haven't checked the wind direction! All learnt from experience.
I use 'Wet and Forget'... it's not cheap and you need a sprayer but I find it works.. some people get disappointed because they don't always see an immediate result, but after some days usually, or a week or two, you suddenly see that it's all gone clean, sometimes the next day... I use it on walls, paving slabs and algae covered wood, like fences and trellis...
I'm with Marlorena with Wet and Forget, much easier. I think my trouble with the power washer is that (a) we've got soil near some of the paving and (b) a lot of the mortar between the slabs has come out and the power washer washes up the sand underneath. I've got the round patio washer thingy which is a bit less messy but it may be that our water pressure is too high and I need to adjust it somehow?
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I use it on walls, paving slabs and algae covered wood, like fences and trellis...