I think @GoodFaith's answer has covered it all =P I find that exfoliating before shaving helps to keep skin smooth. I use a shower glove everyday when I shower, so exfoliating is part of my daily routine. I do it gently to not irritate my skin. I find that if I leave shaving cream or a moisturizing soap for a bit before shaving int the shower, my shaving is very smooth.

It's just I don't think I have the money or time to go there. :D I tried a sugaring myself once....didn't happen, haha! Waxing doesn't work for me, I must have tough legs! Sigh.... I'm not sure if it is the jeans that make my knees darker, I think it's lack of sun or something. Thanks though, @GoodFaith!

I would suggest buying a wash containing either salicylic or glycolic acid, and washing your legs with it. Lather it on, and leave it on for five minutes before rinsing. Both of these acids are able to dissolve the intercellular glue from your knees; which are discolored from the jean fiber pigments. You could also mix baking soda in with some liquid soap you have at home and make a scrub out of it. Scrub your knees with it in the shower. If you want to get red of your shaving bumps, Google a place in your area that does Sugaring. Sugaring goes with the hair follicle rather than against it-so it doesn't create the bumps. It's not cheap, but it lasts a long time and gives a great result. They might be running specials for new clients, so check out the Yelp as well.