Right, let's start with the price. Its the off putting tjing but this lasts a very VERY long time! Regular use on billhooks, shears, secateurs, knives etc and my block is still going strong over several years.
It is worth every penny! Really cuts through general gunk and rust but being almost a rubber compound, it doesn't scratch. Some of my really old tools (my grandads) and crean mate has lifted the dirt right off where items like wire wool has failed. A single drop of camellia oil is my go to although water works but will need oiling after.
I must say though, pair with good oil, and the garden and brass brushes tinker and fix do and your tools will stay more efficient and give you many years of service.