Having experienced 27 years of wedded bliss now, I'm not really an expert when it comes to dating. However, a friend of mine that is quite successful with the opposite sex is quite conscious of his car. He earns a decent living and is a really nice guy, but doesn't really care about what he drives, and sees it as transportation, nothing more. But, he acknowledges that your car can say something about you.
So, his 13 year old Civic sedan is spotless when he goes on a date. Really, spotless. He keeps the interior looking like new, and I have to say, riding in this old Civic you do notice this.
Next, he keeps his home the same way. When the relationship progresses to the point where she is coming to his place, she finds it not only tidy, but clean. Really clean.
It works.