You may not believe it but your TX (Transmitter) can get pretty nasty overtime.
Its always being held by a sweaty palm. Getting blasted with nitro fumes and gas. Catching dirt and clay from off-road tracks. As well its getting oxidized from always being used out in the sun.
Allthough it may not appear or feel dirty to you at the moment , once you clean it youll see the remarkable difference.
General Purpose Adjustable Spray Bottle. You can find these at the grocery store , hardware store and the like. They also come in very handy for a number of things related to RC. I picked up mine for around $1.00, Id suggest getting a couple.
Woolite. Yes Woolite , this stuff is a mild detergent and is very easy on everything as well wont cause any reactions to yourself.
Distilled Water. You can use any water , but the best is bottled or distilled. This will help reduce water spotting.
You then mix up anything over 30/1 water to woolite ratio. I basically fill the bottle up , and drop in half a teaspoon or so. Then test your solution on something and rub around , it shouldnt get overly soapy.
Then once your solution is ready. Set the spray bottle to a fine fine mist. Mist up a microfiber towel or any soft cloth. A paper towel will also work. Dont soak it , just give it a few squirts. Then I generally shoot one nice mist on the TX....dont worry the water will lay thousands of tiny droplets that wont move anywhere. Be sure to not soak the TX or the water will start moving.
Then proceed to do the obvious and wipe down the TX. I generally rub it and kinda twist at the handle. This helps get that grime and oil off the TX. Then take a look at all the brownish grim and dirt you just removed.
Now grip your TX and enjoy that brand new feel again. You will also notice it will become much shinier and new looking. The LCD's will be grease free and easier to read.
I race monthly and perform this in between races. Even with just little use per month it always seems to get nasty. It may not win you races..but this removes the oxidation which will help preserve your TX as well keeps the blacks dark and new looking.
Hope you guys enjoy the little tip.
You can find more information like this at: Pro-Hobby