Q: how to make the trackpad more sensitivity

the only option i am aware of is system prefereces>trackpad>point and click>tracking speed.

I used microfiber cloth and two droplets of windex for cleaning my trackpad...

It worked like a charm!

shldr2thewheel,  Has given you the correct answer. Don't forget to look at the Legend on the lower right.

Cheers

Don

In addition to the afore mentioned sugessstions

If you use hand cream it will build up and cause a loss of capacitive contact, or where jewelry this can cause issues.

Windex may be a bit too strong, and cause problems.

You can clean it with eyeglass foil packed cleaners, the type for glasse with coatings ( available at walmart, cvs, etc,, They have very little moisture, wipe around the pad, pressing down around the edges to clean it. Make sure that the computer is turned off, and the power supply is disconnected. Use sparingly, and allow a couple of hours at least to dry completly.

Also read the following:

http://support.apple.com/kb/TS1248

http://support.apple.com/kb/TS1449

Then try again.

Hope this helps