I found you site researching Neolith 39N. Thanks for offering to give advice, its very kind.
I've got a yellow brick victorian terrace in north London. I'll have some scaffolding up in a few months for some roof work and I thought it might be a good opportunity to clean up the bricks at the front of the house.
Theres not much info on doing this DIY on the internet. Most things I could find were warning that using the wrong method will ruin my brickwork. I did however find on some forum talk of flow plant chemicals. Looking at their site and yours it seems that "Neolith 39N" might be a good option for me. But it would be good to know if its strong enough -or if theres a safer option even.
Any help appreciated.