Don't clean your tool with it.yeah that's what I do with it, use it to clean my tool
I know a guy who did that. Several days later he flicked a nub end down the same drain. Blew about a miles worth of manhole covers off!Some years ago I tipped a load of old petrol down the drain next to the Police Station. I wouldn't recommend that either. They couldn't use the interview room for a fortnight until the fumes had died down and they didn't find it funny. Not as funny as I did anyway.