Honestly, it depends on what we think of light skin and dark skin.
People usually think that white means clean, soft etc... and black means rough, angry, bad personality and more.
The truth is this is not true! I dated both black (light skin and dark skin) and white ladies. I'm black and my skin is softer than my last girlfriend's and she was white and blonde so saying that white skin is softer than dark one is false,
Also, I dated black girls. some of them were calm, nice and careful (drama-free) and others were just full of drama. same thing with white ladies so, I think that ladies are all the same.
I don't know much about cleanness. Most of my friends are white and they have stuff everywhere in there cars, their [dip] thing is everywhere, saliva in bottles everywhere. that's is the peak of dirtiness! also, their rooms are just dirty. My black friends also have dirty rooms as well as my Asian friends so I think being clean is more about who you are. I'm freaking clean. I hate dirty people, I hate stinky breath... so, all those ideas about white and black is just false.
The first think I look at in a lady is a good personality. Then, I see how smart the person is followed by her outside look (eyes, smile).