You can try everything from shampoo to bleach to hydrochloric acid. But you need to use an exterior, waterproof sealer or these accidents will likely cause several stains over the years. ☺️
Hydrochloric acid will actually 'bleach' the colour out of anything, and you will be left with a 'white' type of stain. Try a 'water blaster' (or water pressure cleaner) type of equipment. We call them here in Australia a 'guerney'. But you connect your hose to the guerney, and if you have an industrial type of water pressure cleaner, then hopefully you might be able to minimise the stain - depending on what it was. I am sure you could probably hire one from your local hardware store.
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My question as I watched these grandparents was always, "Why are you sweeping your yards, and why is there no grass around your house?" We have grass around ours.
You can try everything from shampoo to bleach to hydrochloric acid. But you need to use an exterior, waterproof sealer or these accidents will likely cause several stains over the years. ☺️
what type of stain?
Hydrochloric acid will actually 'bleach' the colour out of anything, and you will be left with a 'white' type of stain. Try a 'water blaster' (or water pressure cleaner) type of equipment. We call them here in Australia a 'guerney'. But you connect your hose to the guerney, and if you have an industrial type of water pressure cleaner, then hopefully you might be able to minimise the stain - depending on what it was. I am sure you could probably hire one from your local hardware store.