For the most part a MIDI keyboard is low maintenance. You seldom will have any complaints as long as you don't do anything major to it - like dropping it from a 10 story building or get it run over by an 18-wheeler.
OK maybe those are extreme examples but barring any major incidents intentional or unintentional then expect to enjoy a lifetime of use (your keyboard's lifetime that is). That being said it doesn't mean your equipment doesn't have to be cared for. It's exactly because life is unpredictable that you need to actually take care of your MIDI keyboard.
A simple way you can do this is to make sure you keep everything clean. Now hold on before you grab every cleanser in the house you need to know that cleaning your electronic keyboard is different than cleaning other things. For one thing the fact that it's an electronic keyboard should give you a sign - it uses electricity so liquids such as water should not be used less you want to fry everything, including yourself.
Don't spray or use any chemical cleansers either. Your keyboard may not like it and discoloration may just be the least of your problems.
Use a soft lint free cloth to wide everything down. To reach between the keys use those small brushes that they sell in computer shops that pick up dirt and such yet have soft bristles so they don't scratch your MIDI keyboard.
Compressed or canned air is great to as it can blow those pesky dirt, dust & debris away without doing anything else to your equipment. Or you can use those small vacuum cleaners or the small tube attachment of your regular vacuum cleaner.
To really get those nooks and crannies clean - the knobs and sliders for example - use a cotton swab and some rubbing alcohol. Be gentle and don't rub hard. Once you're done make sure to wipe everything dry - again with a soft lint free cloth.
You can also be proactive in caring for your MIDI keyboard. For example before you begin using it wash your hands to remove any body oils and dead skin that can be left on the keys. You can also use a cover when not using your equipment to prevent dust from collecting on it.
It also helps if you don't eat or drink anything when you're using or playing with the keyboard. Even if you're careful you won't notice all those little crumbs that can fall into the cracks or in between keys which can potentially attract ants that can create havoc with the circuits.
The best way to go about it is to regularly clean everything even if you don't see any dirt on it. This way you set the routine to clean and not forget it - it also helps to keep things from building up and making it harder to clean in the future.
Keeping your MIDI keyboard clean makes it aesthetically pleasant to look at which can make you feel better using or playing it and can make it last longer to produce more quality music for you.
Popular culture has depicted chimney sweeps as skinny characters that are covered in soot and push around a broom. Nowadays, you expect your chimney cleaner to be an adult that carries a broom or brush, along with other equipment, like vacuums, cameras and other special tools. It wasn't always like this.
The profession came about with the Industrial Revolution, when more and more buildings became home to chimneys. Chimney sweeps during this time were called master sweeps, and would teach the craft to young boys (and sometimes girls) who were called "apprentices" or "climbing boys." The children were found at orphanages or bought from their parents, for minor payments. Apprentices were indentured to the master sweep for seven years, and after the end of his apprenticeship, he would become a journeyman sweep and work for a master of his choice.
These children would be the ones who cleaned the chimneys, by actually climbing inside. The boy would pull his hat down over his face, and hold a large brush over his head, and put himself into the flue. He would travel through the chimney, using his body and brush to remove soot, and a scraper to chip away at what wasn't easily removed. Upon exit from the chimney, he would then have to bag up the soot (which was valuable at the time) and carry it back to the master sweep's means of transportation.
Apprentices would sweep four to five chimneys a day. In order to harden the skin to prevent scraping of knees and elbows, the master sweep would often stand them close to a hard fire and rub in brine using a brush, doing this each evening until the skin was hard. These apprentices earned no wage, but were fed by the master sweep, and bathed once a week. If an apprentice wasn't climbing high enough or moving as fast as the master wanted, the master sweep would light a fire or send up another boy to prick pins into the apprentice's feet or other areas.
There were many dangers with the profession at this time. Chimneys were hot from fires, or still on fire in some cases. Boys could get stuck, and if they struggled, they became wedged tighter. For narrow chimneys, the boys would have to sweep naked.
Regulations didn't begin to be passed until 1788. The first such attempt, the Chimney Sweepers Act 1788, lacked enforcement, but the Chimney Sweeps Act 1834 fixed many of the needed issues, including not allowing apprentices under 14 years of age, no more than six apprentices per master sweep, and climbing boys were not allow to be used to climb flues to extinguish flues.
More regulation came in 1840 除甲醛 when it was made illegal for any one under 21 to sweep chimneys. In 1875, regulation was passed that required chimney sweepers to be authorized by the police after the death of a 12-year-old boy and the imprisonment of his master.