Is this a good idea?
Sometimes the electronic products could need this to be cleaner.
Could be save to use a 3 1/2 cleaning kit in MSX Turbo R and other MSX computer systems? How is the best way to clean the cartridge connector?

I have never had the need to clean a cartridge connection, but did use a 3.5" cleaning kit on my turboR once.. worked like a charm...

I've heard that the best way to clean cartridge connectors without doing any harm is by using a optical fibre brush. Or micro fibre brush. Solvents like alcohol can cause damage and dissolve things. Some examples are here: http://www.visibledust.com/sensor_cleaning_products.html