Past simple result negate ?

CalifJimImagine that a child comes to the dinner table. His mother can ask either of these questions:

Have you washed your hands?

Did you wash your hands?

And this show that those tenses can be used interchangeable even when we see it through analyzing them in terms of results. Because it means the same because in one he has clean hands or not in other one it indicate the action he did it or not. And it's for me clean as diamond. But I was looking for the way how to interpret those 2 tenses If I know that we want to indicate action or result that can be interchangaeble when we think a little bit is more logical than saying (Past but what with result we don't say in web sites - and everybody thinks that they know when to use it and what the meaning it has behind ... )

CalifJimUse the search box to find tons of questions and answers about this topic.

Well you think I didn't used it ? Well I used and the only thing they were saying is quoting web sites without answearing (Result - what is result for them ? how do they see result in Past ?) If the fact that we can use it more by Past = Action / Present = Result but some facts can be interchangable regarding to want we want to emphesis or just want to ask without thinking about it.

For the end of this not small conversation. Past simple - more indicated in action but result still exist but action is more important / Present perfect - result is the thing here but action must be to show what result we have now

As a example from the book

Do you think he has interfered with those kids - result he is thinking if those kids aren't wounded or something (book)

Do you think he interfered with those kids - He want to indicate action the result can be same as th present one but he here more important was action

Or maybe we can use it interchangeable because it's pretty same. Or maybe the character used this tense because he wasn't thinking about which tense to use