Tangential story. About 7 years back I had a Saturn SC2. One day the warning lights and speedometer etc went all wonky. Car wouldn't start etc. Mechanic said it's likely the computer needs to be replaced.
Fast forward to me figuring out where it was located. I removed it, blew out the connection with just my mouth as I didn't have compressed air to use, and put it back. Worked perfectly after that until my shifting forks cracked several years later and I had to junk the car. Man I loved that car. Good ol' Phoebe (a moon of Saturn and what I named my car)
Yeah well, I will still blow into my NES games, no matter how many youtube videos and articles try to tell me that it's bad. It works and I've never had any ill effects and I've been doing it since the 80s.
Isopropyl alcohol (99% is the good stuff), maybe 2-4 cotton swabs, air dry. Dip swab, rub contacts softly, flip sides of cart, rub, cycle swab, repeat. I had no idea for so many years I was actually damaging the cartridges by blowing into them which just put hot air and moisture on dust. If you have any Switch cartridges or older, and haven't done a proper cleaning, it's amazing how shiny and vibrant the contacts will end up looking, along with the cartridge working more stably.