Was told by the building supplies shop that the patio cleaner would be fine on my new front garden, even after I said I'm sure acid based can't be used on Indian stone, but was told no they use it all the time, luckily I only used on the ending blocks but it has ran into the paving and I have lots of yellow patches, is there anything I can do to help with this issue ? 🤞🤞🤞🤞