Gas Tank

[Diggy]

Quick question guys and gals, just curious if its a good idea to clean out a gas tank, the bike I bought was owned by one other person, I have the gas tank drained and off the bike. Would it be a good idea to clean the inside of it, any if its a good idea how do I do this.

I took a flash light and looked inside and I did see some little brown stuff in the cracks of the tank. Just a little bit tho. S

Also since I have the gas tank off, and pretty much the engine showing.
What else can I do to improve my bike / motor.

Its a 2007, LF200GY-2 Great Starter Bike!

I did notice that when I was riding it this year the switching gears, getting back into neutral was kinda tough. I had to go down one and back up and down one. Im not to sure on how the gear system works, but maybe I can take something out and clean it or maybe replace it. The owner before me was a young boy 17 years of age that his father let him ride.

Any tips on anything please let me know. I have all winter to do improve the bike.

Thanks Kevin