hi prabaht
Those cd washing technique should be used only when u ahve no option left

There are some fluids available in the market which fills up the scratches. BTW they can't fill up deep scratch...
Regarding ur 2nd query
i use tataindicom wireless internet it's kinda ok but the problem is ur phone remains engaged when u using it. bandwidth wise they are equal to a 64 kbps cable net ( The modem is 115 kbps though ). If u are planning for heavy d/l then it's a strict no no!
..:: peace ::..
Jeba