Well, it seems the context you've provided is about as helpful as a screen door on a submarine. One source is just the standard YouTube legal footer, and the other is a ghost of a Reddit link. So, let's ignore that digital tumbleweed and get straight to reviving your poor, discolored sofa from its pale and tragic state.
First things first, you need to play detective. What kind of leather are you dealing with? Is it a fancy, unprotected aniline that drinks up spills like it's last call, or a more robust pigmented leather with a protective topcoat? A quick test: put a tiny drop of water on a hidden spot. If it soaks in quickly, you've got absorbent leather. If it beads up, it's protected. This will determine your plan of attack. The cause of the discoloration matters too—is it sun-fading, a chemical spill, or the ghost of a thousand spilled coffees?
Before you start slathering on mysterious potions, you must clean the area. Use a proper leather cleaner to gently scrub away the dirt, grime, and body oils that have taken up residence. You can't paint a masterpiece on a dirty canvas, and you certainly can't restore color to a grimy couch.
For minor, sun-faded woes or general wear, a colored leather conditioner or balm can work wonders. Think of it as a tinted moisturizer for your furniture. It nourishes the leather while depositing a bit of color to even things out. For more dramatic color loss, however, you'll need to call in the big guns: a leather dye kit. These kits usually come with a cleaner, the color dye, and a sealant. Don't be scared; it's basically a paint-by-numbers project for adults.
Whatever product you choose, test it on an inconspicuous area first, unless you're a fan of high-stakes gambling with your living room decor. Apply the product in thin, even layers using a sponge or soft cloth. Patience is key. Rushing will leave you with a blotchy mess that looks worse than when you started. Once the color is restored to your liking and is completely dry, apply a leather finisher or sealant. This is the top coat that locks in your hard work and protects the sofa from future indignities.
