Kells

I had a follow up question... The gaps between my slabs are quite large and deep and I was wondering if I could partially fill with sharp sand and top up with the proper filler? To save on cost...?

Yes, I went and bought 5L of expensive stuff for black spots and realised it's just strong bleach and you can at least buy Sodium Hypochlorite which is a lot cheaper than the stuff sold specifically as black spot remover. I guess ordinary household bleach is just as good!

That looks like exactly what I need! Thanks!

Thanks guys, looks like both of those are the same as I what I was thinking. Now I just need to get the stubborn spots off the paving... anybody know how?

Hi there, I've moved to a house and just had a go at jetwashing the paving slabs. The grey/green surface dirt is coming off but they have all these spots, more in the shady parts, that the jetwash won't get off, see attached pics. Think there's also some oil stains. Any ideas as to what I can do to get them properly clean? Also second question, in half the patio, the gaps between the slabs haven't been filled in so I've had loads of dirt and weeds growing between. The gaps are around 2cm wide. What's the best thing to fill the gaps with? The easier the better. On my last patio, the guy who laid it put this sandy stuff in the gaps and then watered the top which hardened and did the job great. It looked a lot easier than mixing cement up to the right consistency etc. Any ideas what that was and where I could get it? Thanks all, Kelly