I once saw this wizardry
Seen that before as well. Dude is a genius.
What're your two favorites from that mother lode?
I'll actually step it up one and tell you the three I most commonly do.
Going in order this time ;)
1. Cartridge cleaning
Every single one of my games I have done this to. It makes them like new as a 30 year old game can be.
2. Restoring the cartridge connector
This added with the cartridge polishing gets rid of the messing with your game to get it to play.
3. Disabling the lockout chip
Sometimes even after cleaning the game and fixing the connector you still get the blinking red light. It is not uncommon for the lock out chip to give out. Disabling it removes it from the equation of problems your NES can have with the blinking red light issue.
Although what you posted is not untrue.
A lot of the "blowing trick" had to do with the fact that you would reinsert the cart multiple times. The connector actually acts as a cleaning device for the carts. Reinserting multiple times will actually clean your cart to a degree.
But I will completely agree with this part:
It could even be theoretically harmful to the game operation due to the condensation put on the connectors.
This is in my experience 100% true. The moisture and condensation from blowing into the cart will cause corrosion and dirt build up over time.
I strongly suggest you not to blow into your cart. If you feel the need to clean it. A quick and easy fix is to grab a cotton swab (aka Q-Tip) with some isopropyl alcohol (the higher the % the better) and clean the cart that way... yes the back of the cart tells you to NOT DO THIS. I believe that to be a money making scheme.
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