There are many ways to get your bike or motorcycle clean. Some use commercial products specifically made for this concern while some could use things like diesel washing. It is a process found as a stop gap and eventually a good way to keep motorcycles clean by mechanics and owners.
You will need just your ordinary detergent or soap cleaning agents, clothes of several kinds for use wet and dry. The process is easy and will usually be doable DIY, since it does not involve any technical stuff. You do not have to take off parts or dismantle the bike but this specific method of keeping it clean is usually for the underside.
This was discovered more useful than other methods for those parts of the bike which are found below the seat. They will usually be iron, steel or chrome and will be exposed to the elements. Most may have some rustproofing put on them during the manufacture but because of constant use and exposure, they will often develop rust.
Cleaning off their surfaces could take out the dirt, scum and even rust that have accumulated there. However an important thing to remember is that it does not or is not a substitute for rustproofing. This is provided by specific products which usually follow standards for both industrial means and automotive concerns.
The use of kerosene, diesel and similar fuel products are essential. Although you need to be sure that this is clean or new, because used fuel can have some particulates or debris mixed in that can scratch the surfaces. You need several clothes, one for the first wash out using the detergent mixed with some water.
This takes off the topmost layers of dirt and prepares the surface for more intensive cleaning with diesel or fuel. Then you either put on the diesel through another clothe or pour it over parts like chains, wheel spokes and such. While this will be a rust preventive, it actually is not something made to combat oxidation.
Then you wipe out all the gunk that attaches to the oil and these will include some of the worst items that could be found. Also, you should reuse the used clothes so that you do not inadvertently wipe the debris that have been taken off. The wash is so called because the result is often a cleaner and more workable part.
It is something that could be done everyday, and when done diligently and with care, will be part of the upkeep and maintenance for your bike. This is not something that is applicable anywhere else except in the same kinds of parts for cars for instance. But the underside of the chassis for any vehicle is often harder to address.
The chassis underside too is a hardcore part of any vehicle and can withstand the maximum amounts of damage or dirt from usage. But the parts that are comparable for motorcycles are seen or exposed to view, and while most of these are above the road enough for some protection, when dirty, you certainly will see them. So everyday cleaning like this is needed.