In Britain, I used Swarfega.

I couldn’t find it in the USA for a while but I just looked and you can get it at Walmart.

Take some gel and thoroughly rub into your hands and arms. Take a rag or paper and wipe off excess. Then wash hands with soap and water.

I’ve also used Gojo with the grit particles. This feels more industrial than Swarfega and it stings if you have any cuts or bruises. It also dries your skin a lot.