You should probably do it twice, before and after. Just to be on the safe side.
In the very first episode of House M.D. we establish that House washes both before and after.
We then watch him go to the bathroom at least a dozen times throughout the series, and not once does he wash before. Worst. Series. Ever.
I'm not interested in getting your 'pickle juice' on my hands. I don't care if you washed your hands before. 'Pickle juice' splashback happens when you've got your hand down there. So wash after the fact, Jack.
Don King had an alternative thesis:
https://youtu.be/o4qo161MRNE?feature=shared
You should probably do it twice, before and after. Just to be on the safe side.
In the very first episode of House M.D. we establish that House washes both before and after.
We then watch him go to the bathroom at least a dozen times throughout the series, and not once does he wash before. Worst. Series. Ever.
I'm not interested in getting your 'pickle juice' on my hands. I don't care if you washed your hands before. 'Pickle juice' splashback happens when you've got your hand down there. So wash after the fact, Jack.