The Throttle bodies have a teflon coating on the inside bore that starts behind the throttle plate. The reason for not using cleaner or wiping in that area is becasue of the chance of abrading away the coating.

The first thing you can try is to clean the outside of the throttle body like the areas where the throttle cable attaches. Clean the throttle linkage and return spring they tend to get dirty over time.

I feel sorry for the people who don't drink. When they wake up in the morning, thats the best they're going to feel all day - former President Lyndon B. Johnson