Sliding a pick

Hello guys. (and girls.) I would appreciate some help here. You know how sometimes guitaists slide a pick throughout the neck and it sounds cool?
Well, been trying to do that for some time now. Oh, yeah, i can play it, but it always sounds like, well frankly s***. So please, guys, help me out here. what am i missing in this story? I know it is not the pick, cause i tried heavy picks, medium picks, metall picks, even wood. Nothing seems to do it for me.
Is it the strings? Or the sound? Or yust for some reason, i don"t know how to play it? if so, enlighten me, please.

Thank you in advance.

Get the tip of the pick and brush them with the coils of the three bass strings. Dont slide the body of the pick, just the edge.

nothing really to it. No there is no PROPER way to do this. This is the way I do it and there are many variations.

Hold the pick so it is at a right angle (90o) across the strings and slowly scrape it up or down the strings. A little distortion will also help !

You may end up with lots of little holes in your pick !

The way Iron Maiden does it is my placing the pick parallel with the strings and just riding the pick on the strings.

Its weird... but makes a differnt sound

It's all about experimentation. Just try different approaches, until you find one that works.

Loads of distortion, and the 3 bass strings are easiest for pick slides.

Keep trying it, you'll get it.

There's a song by Steve Vai called "Little Green Men" in which he mimics two voices talking through bad radio. I like doing a simmilar (no trem) thing with wah, distortion and the pick. I call the wound strings "male voice", and others "female voice", and then I play with them. You can use other things instead of the pick too. Try bouncing a metal pen on a high e string.
When I want to go higher than the fretboard range I slide the pick upwards on a high string and stop when I reach the desired note, continuing to scratch it in one place to produce the tone.
Try scratching with your nails as well.