I personally don't like the spray on aeorsol nitro cleaner, it seems to make a bigger mess. The only way to clean your rig is to do it right, and there's no shortcuts about it. Pull all of the components off of the chassis. You can leave the a arms on sometimes if you pull the shocks, turnbuckles, and bearing carriers and hubs off, but I find it easier to deal with once I've removed everything. I then lay everything out on a clean towel in a neat organized manner. It's easier to keep up with small parts that way, rather than just throwing everything in one big sloppy pile. I then use Windex multi surface with vinegar, and clean all of the components good and put them on another clean towel to keep them seperate. I use Q-Tips with the same cleaner to get in the small cracks and crevices, and a toothbrush works good as well. Once I get all of the components cleaned, I claen the fuel tank really good and wash it good and make REALLY sure to rinse all residue of whatever soap or cleaner that you use. I then dry it out as best I can with paper towels, and prop it up with the lid proped open so that it can air out for a day or two. Then I start on the chassis with the same Windex multi-surface cleaner. I always make sure not to let it set on the chassis for very long, just in case the vinegar could harm the anodizing. Once that's all finished, I take the wheels and tires and wash them really good in the sink with dish soap, being very careful with them so not much soap gets into the foam. I then let them dry. Lastly, I coat all of the plastic and nylon (such as RPM arms) with Armor-All. It acts as a wax and helps keep dirt and dust, pollen, stuff like that from sticking and makes them easier to clean.
Now I know it takes longer than just spraying it down with aerosol, but at least you'll have a clean rig that you can be proud of, and when you post it for sale, it wont look like some people that take a picture of their ride after it looks like it's been eaten and digested by pigs, with 2 years worth of caked on dirt. How can you be proud of something like that?