The BEST way for me to do this, for the older games that do not have HOLO labels, is to first try hard to clean the cart off using the clorox wipes, but squeeze the most of the cleaning liquid from them first so it does not get everywhere and damage the label. Clean the cart off real good and when the wipe is about as dry as possible, then clean the label off a little bit at a time, and wipe it on a clean soft cloth just to make sure the moisture from the cleaning wipe does not damage the label, and when the label is as clean as it can get, I use Scotch brand 3/4" Gloss tape, and I line it up perfectly and I apply it to the old style label just right. Once the tape is applied perfectly, apply pressure starting from the middle of the label and press from the middle to the right of the edge and then again from the middle to the left edge of the tape.
Once this is done, you need to take a sharp razor and hold it flat down on the very edge of each edge of the label and pull the excess tape up until it gets the the razor and then press the tape using your fingernail to make sure the tape is firmly on the edge of both side of the label, and then use the razor to cut the tape off where the label ends. Once this is done, use a hair dryer on hot /high mode and use it going back and forth across the label for a bit but not too long, this allows the scotch brand tape to really apply itself to the sticker making them become one, and once you do this immediately use a semi wet cloth or bath towel to wipe the tape back and forth until there is no sign of the tape having any strange look to it, so it looks natural.
After all of this is done, you can open the game up and not have to worry at all (basically), about damaging the label on the game. I have done this to EVERY game I have on MVS that uses the paper type sticker/label that is non holo, and the results are outstanding. They shine like a holo label does, and I can open them up and not worry about ruining the sticker at all and it also preserves the sticker for the future so time itself does not make the sticker bubble up, or crumble away. Also if you buy a Shockbox for the game, and keep the game inside the shockbox, that will lengthen the time that the label will stay in like new shape.
However, DO NOT do this to any holo sticker games as once the tape is applied to them, the holo rainbow looking stuff will absolutely 100% disappear, and if you try to pull the tape off the label, it will pull the holo rainbow stuff off with it, so this method is ONLY good for old paper style labels. I have a full "how to" with lots of pics on this process on my FB page if anyone is interested in preserving your MVS games labels so in the future you can have beautiful looking labels still AND you can open them up and clean them out without the worry of damaging the sticker as long as you dont open the game ALL the way up.