what tools to clean up video

all the dv files are noisy, snowy, like a bad connection on a tv, not sure what to call it, it is more noticable during dark scenes, really bad, also some occasional lightning like flicker lines here and there not major but enough for me to go into and edit out, also had borders on sides and squiggly line on bottom throughout all clips which I have been taking into mpeg stream clip after imovie just to crop, but I am wondering now if cropping is making things work, I crop 5 on each side and 8 on bottom, top seems fine, saving as dv and been trying to export in mpgstreamclip mp4, h264, like 80% quality, interlaced, 5000 data limit, and although the color is more vivid that fuzz, noise, etc is over the whole video on every dv, these tapes are anywhere from 5 years old to 15, but the most latest (2003) are just as bad...I converted a few last year to a standalon dvd recorder and the quaity is good, zero noise, more vivid, however when you scale the video in qt to play and on my iopd to tv they are blotchy... I know I cant create miracles with old analog but want the best I can, these are of my kids... I transferred using a digital and thought the digital8 had issues but picked up a hi-8 analog and pass thoughed to a mini dv, and snowy noise is still there, so dvd encoding does something to get rid of this, but I really dont want dvds, want to play on an apple tv, maybe a ps3, or my mac mini

years ago as a web designer we had a program called media cleaner pro, I need something like that I think, if I had a place to upload I would to show you what I mean

cleaned up a bit with that tool, but it seems it was/is a low light issue...Thanks