DON’T let your accordion be exposed to drastic temperature changes or extreme temperatures. For instance don’t leave your accordion in a hot car or outside in freezing temperatures. The drastic change in temperature could cause certain materials in your accordion to either stiffen up or start deteriorating.
DO let your accordion be exposed to fresh air every once in a while. If an accordion remains unplayed for some time, dust can collect in the bellows causing blockages and deterioration to the bellows. Expanding the bellows and clearing out any dust that may have gotten into the bellows will help to expand the quality and longevity of your accordion.
DO get a well-constructed and airtight case. Since things like humidity and salt air can damage your accordion, a case that prevents those elements from coming in contact with your instrument is essential. A well-constructed case will also ensure as little damage as possible will be sustained by your accordion if it were to be bumped or dropped.
DON’T store your accordion in a basement or in an attic. Similar to some of the above reasons, basements can often be humid areas filled with mold that can creep inside the bellows of your accordion. This could cause expensive damage as well as putting your accordion out of commission for some time. Attics can also contain other pests like dust mites or small rodents that may chew through your precious instrument.
DO keep your accordion away from humid and salty environments. Humidity and saline air are some of the worst things for an accordion. Humidity and high levels of salinity in the air, like by a sea or ocean, can cause a build up of moisture in the bellows causing mold or rust the metal on your accordion.