Apologies from an old newbie (!) if that makes sense. If this is already covered then please say.

I saw on Youtube or something that you should never rinse the soap off your blade with water. Why not? If you dry it after.

If not, what should you do? Paper towel, terry towel, trouser leg (probably not a good idea!). And then, before you close it up, how should you treat the blade? Nothing? Silicon oil, gun oil, olive oil, baby oil?

Any advice really appreciated.