Easy to use.
Put a small amount in a plastic pint glass and used a kitchen long handled brush to apply. Two applications did the trick. Rinsed off with the hose. Caution. You need the right PPE. I had rubber gloves and goggles. Even so I got a bit on my skin and it did burn. Rinsed off with the hose fixed it.
Could do with a smaller amount. 5Ltres is a bit much. I have offered it to my neighbours who have a similar issue.
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